This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Measurement and Prediction of the Heat Flow and Temperature Level in a Precombustion Chamber Diesel
Annotation ability available
Sector:
Language:
English
Abstract
Heat flux and temperature mapping were carried out in necessary detail in the combustion chamber of a pepper-pot type pre-combustion chamber diesel engine.
A test set up was specifically prepared for this purpose in which heat fluxes were measured by specially designed traversing thermo couples, four of which were installed across the cylinder head and five were fitted along the cylinder liner. In combustion chamber locations not subjected to very high heat flows viz pre-combustion chamber tip, fuel-injection nozzle tip, exhaust valve..etc but their temperature level is the all-important factor in service, fixed microthermo couples were embedded in the metal as close as possible to the gas face of the component. The widest possible variation in load and speed was applied and it was found that the predominant factor affecting the heat flux and temperature level was the fuelling rate unit piston area, effected by engine load and/or speed. Qualitative evidence suggests that piston heat fluxes follow the same pattern of that in the cylinder head. Heat flux and temperature level correlations were developed for the various combustion chamber components.
Heat fluxes and metal temperatures seemed to follow the direction and intensity of air swirl. Thus they proved to be considerably higher in the present engine in comparison with compression-swirl or induction swirl engines. As a result, pre-combustion chamber engines will be more difficult to uprate than comet or direct-injection engines and thus will require modification more readily. Contrary to most other types of engines, the centre region of the cylinder head of the present engine which encompasses the valve bridge, did not exhibit the highest thermal load. In fact the outer locations of bore are the critical zones in design.
Recommended Content
Authors
Topic
Citation
Raafat, N., Fahmy, A., Radwan, M., and Shams, A., "Measurement and Prediction of the Heat Flow and Temperature Level in a Precombustion Chamber Diesel," SAE Technical Paper 841133, 1984, https://doi.org/10.4271/841133.Also In
References
- Vegetable oil fuels Proc. Int. Conf. on plant and vegetable oils ASAE August 1982
- Tiedema P. Alternative fuels in transportation Proc. 2nd Int. Conf. on Technology for development GOFI 1 Cairo May 1982
- Davies G.O. Freese R.G. The preparation and performance of coal derived fuel-Proc CIMAC Helsinki 1981
- Vergara W. Yang V. Castello Branco J.R. Biomass energy production Proc. ISES Brighton 1981
- Needham J.R. Norris S.R. Jones Cooper B.M. An evaluation of unthrottled combustion system options for future fuels - SAE 830374 Int. congress and exposition Detroit 1983
- Norris Jones S.R. Russel J.T. ‘FM’ - a high efficiency combustion system for the future light duty engine? SAE 820760 passenger car meeting Troy, Mi 1982
- French C.C.J. Fuels and engine for future light duty vehicles - 4th Int. Seminar on developments, in fuels, lubricants, additives and energy conservation Cairo March 1983
- Radwan M.S. Tee N.D.C. Highly turbocharged small automotive diesel engines I. Mech. E., J. Auto. Engrg. 6 29 April 1975
- French C.C.J. Hartles E.R. Engine temperatures and heat flows under high load conditions Pro. I. Mech. E. 179 1964-65
- French C.C.J. Problems arising from the water cooling of emgine components Proc. I. Mech. E. 184 29
- French C.C.J. Taking the heat off the highly boosted diesel SAE paper No. 690463
- Alcock J.F. Thermal loading of diesel engines Trans. 1. Mar. E. 77 1 1965
- Shams A.M. Thermal loading of a pre-combustion chamber diesel engine and its prediction M. Sc. thesis Faculty of Engineering and Technology, University of Helwan 1984
- French C.C.J. Atkins K.A. Thermal loading of a petrol engine Proc. I. Mech. E. 187 49/73 1973
- Pearson B. Wallace W.B. Medium speed diesel engines using residual fuels DEUA, pre-print 329 1969