Nvn lefse powerpoint presentation v2with notes
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The LEFSE Project aims to develop an exhaust system for vehicles operating in harsh environments that reduces excessive back pressure, fuel consumption, emissions, and exhaust noise levels. The project is led by Vortex Exhaust Technology and involves research partners Fibretech and Biointel. The new exhaust system uses Vortex technology and a durable, lighter weight baffle to reduce noise levels to below 79dB and aims for below 76dB. Initial testing showed a 10dB reduction in noise compared to the original system. Further development is needed to ensure durability over long-term use and meet stricter 2020 noise limits. Dissemination of the results will target defense, rail, drone, off-road, and marine applications.
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Nvn lefse powerpoint presentation v2with notes
- 1. LEFSE Low Emission Fuel-Saving Stealth Exhaust (LEFSE) Project Lead Company: Vortex Exhaust Technology Ltd Consortium Research Partners: Fibretech, Biointel Biointel Industrial R&D. Slide 1
- 2. Presentation given by: Paul Williamson MBA, BEngMech., Engineering Consultant - Vortex Mike Campbell MBA (Open), BSc., Director - Biointel 2 Slide 2
- 3. LEFSE Project Aims & Objectives For vehicles operating in harsh environments: Reduce excessive engine exhaust back pressure to OEM specification Reduce fuel consumption Reduce exhaust NOx and diesel particulate emissions Reduce exhaust noise levels below 79dB – and further aim for less than 76dB Timeframe 6 months project. Actually took 7 months to complete proof of concept. 3 Slide 3
- 4. A comparison of the old exhaust baffle below, and the new exhaust baffle above – less than half weight and a more durable construction 4 Slide 4
- 5. Vortex technology already delivers key benefits 5 Slide 5 Reduces excessive engine exhaust back pressure – in this case actually produced a negative reading (original 15kpa, OEM spec 10kpa, Vortex <0kpa) Reduces fuel consumption – 8-10%+ depending on duty cycle Reduces exhaust CO2 (10 to 30%) NOx (15% temp reduction) and diesel particulate emissions (80%+) So development focussed on noise attenuation
- 7. Baffle material also placed in the down pipe 7 Slide 7
- 8. Initial exhaust sound performance 8 Slide 8 dB(A) Engine Speed RPM Original System static test Following ISO 5130:2007 86.6 2000 Vortex & Fibretech static test with new structure baffle Vortex exhaust Following ISO 5130:2007 76.6 2000 United Nations 2020 drive by Limited E/ECE/324 76 1875
- 9. 1. Will the exhaust system be durable over time? We will trial the first exhaust demonstrator over a period of 24 months. This period lies outside of the proof-of-concept project timeframe 2. There may be further development to do to meet the 2020 limit set at 76dB 3. Prototype at TRL 7-8, durability and economic manufacture needs to be worked out Further work and considerations Slide 9
- 10. Dissemination Opportunities for Vortex • We will be presenting data at DSEI 2017, the World’s largest military hardware and supplies exhibition. • We will present findings at appropriate automotive exhibitions in Birmingham • We will present findings at marine sector exhibitions, boat shows etc. • We will be exploring On/Off-highway applications with industry OEM/T1s. Routes to Market for Vortex Consortium • Defence - SC Group (Supacat in Honiton) have a large number of defence vehicles deployed that need retrofitting once type approval is gained. • Rail - Unipart Rail are marketing Vortex technology to the UK Rail industry under license, which could be extended to include noise reduction technology. • Drones - A project with AIE(UK) Ltd in Lichfield concludes in November 2017 and applies our technology to rotary-engine Drone exhausts. • Off-Road vehicle and plant and construction equipment – looking for consortium partners to develop new exhaust systems • Marine - Marine applications will be sought to deliver fuel & emissions savings with noise reduction. • Autosport Racing - Vortex has a long history of supplying winning-edge technology to race organisers and race teams; and noise is a major issue for venues. Slide 10
Editor's Notes
- Mike In the LEFSE project the consortium based its research on a military vehicle that has an exhaust which measures approximately 1.5metres in length. The OEM of the vehicle had problems with back pressure and was at the current limit for noise. Back pressure was robbing the vehicle of performance – power and fuel economy. It was considered that the Vortex exhaust technology would be ideal for this application because it would reduce back pressure and consequently allow improved fuel economy and more power and torque. But because of the length of the exhaust the Vortex exhaust, as it was, made excessive noise and required more technology to reduce the noise to within limits. The technology to reduce noise is a sintered baffle material developed during the project by Fibre Technology Ltd in Nottingham The project involved a great deal of trial and error even after using Solid Works CAD Computational Fluid Dynamics to understand flow rates. We moved iteratively towards reducing noise while back pressure remained less than ZERO. Paul
- Mike Here we see the old and the new systems. There is a substantial weight saving using the Vortex configuration. The large muffler box below the Vortex system is a three chambered muffler with Helmholz trap to return the pulse. Paul
- Mike The vortex exhaust worked fine but it was too loud to begin with. Paul
- Mike Vortex had to decide how to use the sintered stainless steel web sheets. Inside the Vortex on both sides of the annulus was an obvious place to start Paul
- Mike The down pipe and tail section also needed the same layering for additional resonance. We have only the picture of the downpipe above. Paul
- Mike We had some false starts with noise above 90dB. After making several prototypes - 15 main parts – and reworking the internal structures we finally found what worked and gave the desired sound performance – and more importantly would allow all of the other benefits: reduced fuel consumption, reduced CO2, NOx and diesel particulate emissions. Oh and improved engine performance. Paul
- Mike The project timescale was adequate for proof of concept but for durability we will need to have an LEFSE Vortex exhaust on a vehicle for 2 years, and then remove and cut it open to see how well the internal structures have held. Paul
- Paul Vortex technology has a broad spectrum of applications for technology transfer. The main ones are listed above. Resonators and Vortex exhaust systems will offer potential stealth capability to military vehicle OEMs. In the rail sector Vortex has recently completed a Vortex diesel train exhaust project with Unipart Rail as a partner. The Class 156 passenger train in the trial at the end of the project had a substantial fuel saving over 6 months in addition to better time keeping owing to improved speed at all throttle notch positions. The drone exhausts withstood the trials carried out by AIE(UK) and met the noise specification hopefully will become a product in the future.