A brief introduction to design and development of Water Propelled resisto jet

1. Design and Development of
Water propelled Resisto Jet

2. Basic designs

3. Objectives
The Tests will be performed to investigate the effects
of Mass flow rate and heater current on
1. Chamber Pressure
2. Thrust
3. Chamber Temperature
4. Specific Impulse

4. • Nichrome coil was selected as heating element and its
temperature is the limiting factor.
•The whole system is put in a thermally insulated case
whose outer boundary is made of stainless steel.
Nichrome coil

5. Nichrome Properties
Material Property Value Units
Modulus of elasticity 2.2 × 1011 Pa
Density 8400 kg/m3
Melting Point 1400 °C
Resistivity at room
temperature
1.0-1.5X10−6 Ω·m
Specific Heat 450 J/(kg·K)
Thermal
Conductivity
11.3 W/(m·K)

6. Nichrome Wire Specifications
PARAMETER VALUE
CURRENT(A) 4
TOTAL RESISTANCE(Ω) 51.7
VOLTAGE (V) 94
HEATED TEMPERATURE (K) 523
INPUT POWER ( W) 170.8

7. Calculations
PARAMETER EQUATION USED VALUE OF
PARAMETER
Mass of water required
for one cycle
(g)
m=ρV=0.5ρπlr² 1430
Energy required (kJ) Q=hm 563
Time for one cycle(s) t=Q/i²R 360
Throat Area(mm2) At=√RTcṁ/ΓPc 4.89

8. • Chamber Efficiency :
= Steam flow rate *(enthalpy of steam at that temperature –
enthalpy of water at room temperature)/(efficiency of coil * heat
supplied by coil)
= 143925.9/0.47*495000
= 0.61
• Unsteady state heat transfer equation with internal heat generation:
1
𝑟
𝜕
𝑟𝜕𝑇
𝜕𝑟
𝜕𝑟
+
𝑞
𝑘
=
𝜕𝑇
𝜕𝑡
This has to discretized and solved numerically.

9. Instruments
Thermocouple Load Cell

10. CAD Model

11. 3D VIEW

12. Timeline

13. Thank you