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IRJET- Experimental Investigation of Flow through Perforated Plate in Conical Diffuser and Analysis of its Pressure Distribution
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 2025 EXPERIMENTAL INVESTIGATION OF FLOW THROUGH PERFORATED PLATE IN CONICAL DIFFUSER AND ANALYSIS OF ITS PRESSURE DISTRIBUTION SHAHUL HAMEED N1, STEFANIYA M2 1B.E STUDENT, DEPARTMENT OF AERONAUTICAL ENGINEERING, APOLLO ENGINEERING COLLEGE, TAMILNADU, INDIA 2ASSISTANT PROFESSOR, DEPARTMENT OF AERONAUTICAL ENGINEERING, APOLLO ENGINEERING COLLEGE, TAMILNADU, INDIA ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - A diffuser is a primary component in an air breathing engine that helps in conversion of kinetic energy into increased static pressure rise results in efficient combustion. The report deals with investigation of flow through conical diffuser of 7° attached with perforated plates inside the diffuser to improve the axial flow and to achieve high static pressure rise without total loss in pressure. A supersonic speed wind tunnel was used for analysis. The values of pressure are determinedusingmultitube manometer and mean coefficient of pressure was calculated using required formulas. Key Words: Diffuser, Perforated plates, Wind tunnel, Coefficient of pressure, conical diffuser. 1. INTRODUCTION Diffuser in an aircraft engine finds it application in slowing down the intake air to reduce flow losses in combustor. Slower air is required to help stabilize the combustionflame and higher static pressure in the slower air provides high efficient combustion. Several geometrical modelsofdiffusers are used which vary in their performanceandefficiency.The prominent function is to improve the static pressure rise without any loss in the total pressure. The total pressure corresponds to the sum of static pressure and dynamic pressure. The air entering the diffuser possesses high turbulent kinetic energy whichisdifficultenoughto be made to high static pressure rise. For this condition toresolve,two perforated plates are placed at inlet to yield uniform flow that has fewer disturbances in conversion to pressure rise. The pressure rise in conical diffuser is studied separately and mean coefficient of pressure in conical diffuser with perforated plates is analysed and the values are compared. 1.1 Conical Diffusers Conical diffusers result in a high static pressure rise generation than any other rectangular or un-truncated diffuser. The parameters thatgovern the pressurerise inany conical diffusers are area of the duct, angle of expansion, length of diffuser and discharge conditions. In ‘AN EXPNENTIAL INVESTIGATION OF THE BEHAVIOUR OF CONICALDIFFUSERSINTRUBULENTFLOW’byV.K.SHARAN, it is advised that in order to maintainhighstaticpressurerise the angle of conical diffusershouldbemaintainedat5°to15°. This angle is generally described as the divergence angle. Fig – 1.1.1: A conical diffuser 1.2 Perforated Plates Perforated sheets, also known as perforated plates or perforated screen is a sheet metal that has been manuallyor mechanically stamped or punched to create a pattern of holes/slots for various applications. Materials used to manufacture perforated metal sheets include cold rolled steel, galvanized steel, Monel, inconel. The two perforated plates used in the diffuser allows the flow to be axial which results in less disturbance and increasedstaticpressure rise. Fig 1.2.1: A typical perforated sheet 2. DESIGN AND EXPERIMENTATION 2.1 Design The inlet diameter of the diffuser is 100mm and the outlet diameter is 170mm. The divergingportionofthediffuserisat
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 2026 an angle of 7°. There are two plates placed at a distance of 450 mm from the inlet. Fig 2.1.1: Diffuser with plates The perforated plates are designed with the cross section dimensions of 55 x 60 mm with a 2.5 mm multi holes in the section. Fig 2.1.2: Perforated holes with dimensions 2.2 Experimental Setup The experiment was conducted in a supersonic wind tunnel. A pipe of 100 mm internal diameter and a length of 900 mm were fitted at the exit of the wind tunnel to achieve a fully developed flow. The present measurements were carried out using a pressure measuring device.Thepressure manometer with Pitot tube is a robust, compact and comprehensive meter to take measurementsofpressure, air flow velocity and flow. The velocity of the flow is maintained at 35 m/s. The value of pressure at each port in thestructure is noted the pressure ratio values are determined. The graphical representation is provided below. Fig 2.2.1: Photographic view of Conical diffuser of half angle 7° Two perforated plates were placed in the conical diffusersat a distance of 100mm and the inlet and exit of the conical diffuser is fitted at both ends in a supersonic wind tunnel and is operated at an initial velocity of 35 m/sec. Fig 2.2.2: Supersonic wind tunnel facility with diffuser 3. NUMERICAL CALCULATIONS 3.1 Pressure Distribution Without Perforated Plates The conical diffuser of 7° angle was initially placed in the supersonic wind tunnel without the attachment of perforated plates and the values of pressure at each ports in the conical diffuser is displayed in the multitubemanometer and the coefficient of pressure is calculated using required formulas. (3.1.1) The coefficient of pressure achieved at each port in the conical diffuser is At A, Cp1 = 0.0014 At B, Cp2 =0.0013 At C, Cp3 =0.00098 At D, Cp4=0.00064 At E, Cp5=0.00040 At F, Cp6=0.00032 At G, Cp7=0.00027 At H, Cp8=0.00024
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 2027 The values are noted and finally compared with the mean coefficient pressure values of diffuser with conical diffuser. 3.2 Pressure Distribution with Perforated Plates CONTINUITY EQUATION The continuity equation reflects the fact that mass is conserved in any non-nuclear continuum mechanics analysis. The equation is developed by adding up the rate at which mass is flowing in and out of a control volume, and setting the net in-flow equal to the rate of change of mass within it. A1V1=A2V2 (3.2.1) Diffuser inlet diameter 𝐷1 = 100mm Diffuser outlet diameter 𝐷2 = 170mm Area for inlet = 𝜋/4*𝐷12 = 7853.98 mm2 = 78.53 cm2 Area for outlet = 𝜋/4𝐷22 = 22698.00 mm2 = 229.98 cm2 . Velocity, 𝑉1= 35m/s 𝑉2=78.53×35226.98 𝑉2 = 12.10 m/sec Storage pressure P = 10 bar Dynamic pressure = ½*𝜌*𝑉2 * 𝑉2 Velocity 𝑉2 = 12.10 m/sec, Dynamic pressure = 89.68 Pa Coefficient of pressure At velocity = 35 m/s 8 pressure ports, At velocity = 35 m/s 8 pressure ports, 𝐶𝑃1= (10−0.99)/89.86=0.1005 𝐶𝑃2 = (10−1.02)/89.68=0.1001 𝐶𝑃3= (10−0.99)/89.68=0.10046 𝐶𝑃4= (10−1.01)/89.68=0.1002 𝐶𝑃5= (10−0.99)/89.68=0.1005 𝐶𝑃6= (10−1.03)/89.68=0.1000 𝐶𝑃7= (10−1.00)/89.68=0.1004 𝐶𝑃8= (10−0.99)/89.68 =0.1005 The general values of coefficient of pressure of conical diffuser without perforated sheets is considered and compared with the above results. Fig 3.2.1: Pressure ratio vs. x/l of diffuser 4. RESULTS AND DISCUSSION 4.1 Introduction In this chapter the computational analysis of the diffuser is carried out. There are many Researchers who have studied the flow through diffuser, nozzle and the inlet of the wind tunnel using CFD approach. So we are going to analyze the diffuser using computational fluid dynamics approach to investigate the mean and turbulence characteristics of fluid flow through the model, and to study the effect of pressure distribution through the diverging portion of the diffuser. 4.2 CFD Analysis The CFD analysis for a flow througha diffusersectionisdone using the ansys 16 software. The boundary conditions for the inlet of the diffuser is given as 35m/s. The flow variation through the diverging portion of the diffuser section is observed. The flow is considered as laminar flow and the ambient air conditions are taken at the inlet section. The validation has been carried out by comparing the mean and fluctuating quantities obtained using different mesh sizes and topologies and different turbulencemodelsagainsttheir data. An appropriate turbulence model must be selected to simulate the flow. Recently, Azizetal.(2008)havecompared the accuracy of the k–ε standard and RNG models for the simulation of turbulent jets and found that the standard scheme performs as well as the RNG scheme. However, the internal nozzle flow exhibits features which are quite different from the jet and therefore one cannot assume that the k–ε standard model will accurately predict the nozzle flow. To assess the capability of different turbulence models to accurately capture the main turbulence features of the flow in the nozzle, we have implemented a one-equation model (Spalart-Allmaras), two equation models (k-ε standard, RNG and Realizable; k-ω standard and SST) and the Reynolds Stress Model (RSM) (Wilcox, 1994).Ingeneral, there are three mesh types available for discretizationof the physical domain, structured, unstructured and hybrid, and each mesh type has its own advantagesanddisadvantages.It is well-known that a 2D quadrilateral mesh is generally of higher quality than an unstructured or hybrid mesh and the
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 2028 mesh quantity can be significantly reduced. The number of cells in the mesh can significantly affect the results, so repeated refinement should be carried out until the desired solution accuracy is achieved. In order to determine the appropriate mesh for the present problemand,inparticular, to ensure that the final simulation results are not dependent on the mesh, the physical domain was discretized with the three mesh topologies described above and with several levels of refinement. The analysis of the diffuser is done using the cfd software, fluent is used for the fluid flow analysis is the test section and the necessary flow parameters are obtained. The geometry of the diffuser with the plates are designed in the module and the meshing of the modal is done. The meshing is don with fine refinement and the quadrilateral type meshing is done for high degree of accuracy. The solution is initialized for hybrid initialization and the solution is run. The diffuser is analysed for various values of the velocity and the corresponding flow parameters in the surface is obtained as plots, graphs and contours. Fig 4.2.1: Flow analysis contour of static pressure (35 m/s) Fig 4.2.2: Flow analysis contour of radial velocity(35m/s) Thus the analysis of the diffuser for various values of the velocities is done and the corresponding values of the pressure are obtained. The flow of the velocity over the diffuser section is done and thecorrespondingvariationsthe pressure in the diffuser section is obtained using the software. The graphs are obtained for various values of the velocity and the corresponding pressure calculations are done using the formulas. 5. CONCLUSIONS The values are compared and thus the values of mean coefficient of pressure fromconical diffuserswithperforated sheets are relatively high when compared toanynonconical or any conical diffusers without perforated sheets. This denotes that ‘higher the flow of uniform flow with slower speed generated by perforated plates resultsinanincreased static pressure rise in diffuser without the loss in diffuser.’ This can be induced in any subsonic engines with further fabrication in the structure that may result in high pressure air entering the compressor whose pressure can be further improvised via compressor and thus may provide a higher efficiency in combustion resulting in greater thrust production. In future, the slots or holes in the perforated plates can be made in copper plates of high thickness i.e.theholesmustbe made as a passage with certain length with change in inlet and exit area of the hole which may serve as separate small diffusers and contribute as a whole. ACKNOWLEDGEMENT I am grateful to Mrs. Stefaniya M, Asst. Prof, Apollo engineering college who guided and made this project a triumph and for sharing her pearls of wisdom. REFERENCES [1] R. Prakash, D. Christopher, K. Kumarrathinam, “Cfd Analysis of Flow through A Conical Exhaust Diffuser”, International Journal of Research in Engineering and Technology. [2] A. Guha, DK. Mandal, N.K. Manna and S.Chakrabarti, “Pressure Characteristic Analysis and Estimation OF Effective Length of a Hybrid Diffuser and Modified Hybrid diffusers”, IOP conference series: Materials Science and Engineering, Volume 377, conference 1. [3] Klein, A., Effects of Inlet Conditions on Conical-Diffuser Performance, Journal of Fluids Engineering,103(1981), 2, pp. 250-25. [4] Lai, Y. G., et al., Calculation of Planar andConical Diffuser Flows, AIAA J., 27 (1989), 5, pp. 542-548 [5] Ganesan, V., Flow and boundary layer development in straight core annular diffusers, International Journal of Engineering Science, 18 (1980), 2, pp. 287-304. [6] Lai, Y. G., et al., Calculation of Planar andConical Diffuser Flows, AIAA J., 27 (1989), 5, pp. 542-548 [7] Lefebvre, A. H., Gas Turbine Combustion, CRC Press, Boca Raton, Fla., USA, 1998
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 2029 [8] Okhio, C. B., et al., Effects of Swirl on Flow Separation and Performance of Wide Angle Diffusers, International Journal of Heat and Fluid Flow, 4 (1983), 4, pp. 199-206 [9] McDonald, A. T., Fox, R. W., An Experimental Investigation of Incompressible Flow in Conical Diffusers, 13International Journal of Mechanical Sciences, 8 (1966), 2, pp. 125IN5131 130IN6139 [10] Jeyachandran, K., Ganesan, V., Numerical modelling of turbulent flow through conical diffusers with the uniform and wake velocity profiles at the inlet, Mathematical and Computer Modelling,10(1988),2,pp. 87-97 [11] Mahalakshmi, N. V., et al.., Experimental Investigations of Flow through Conical Diffusers with and without Wake Type Velocity Distortions at Inlet, Experimental Thermal and Fluid Science, 32 (2007), 1, pp. 133-157
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