Military vehicles bring their own specific requirements to their prime mover; there is little emphasis on noxious emissions but transient response, heat rejection, smoke, power density and fuel consumption are all imortant. The accent is on the transient performance, not only for rapid vehicle acceleration, but also to cope with the sudden load demands which occur while steering tracked vehicles and the rapid changes in rolling resistance encountered as the vehicle is being driven across mixed terrain. The paper reviews these various requirements and their influences on the choice of vehicle prime mover and its degree of sophistication. It then goes on to describe the particular case of the turbocharged diesel engine and the expected benefits of the use of a variable geometry turbine along with fuel injection timing changes. Engine dynamometer testing has been carried out at the Royal Armament Research and Development Establishment to provide proof of these benefits prior to installation in a tracked vehicle. Results of both steady-state tests and a comprehensive investigation into engine transient performance are presented. The transients were selected as being representative of those likely to be encountered in this application. The data shows that a variable geometry turbine is a worthwhile addition, giving much improved response at low engine speeds. In conclusion there is a discussion of further possible avenues of exploration, and their likely benefits.
The benefits of variable geometry turbocharging from the military aspects
Die Vorteile von Turboladern mit variabler Geometrie aus militärischen Gesichtspunkten
Turbocharging and Turbochargers, Proc. of the I Mech E 4th Int. Conf. ; 6 , May ; 329-338
1990
10 Seiten, 9 Bilder, 5 Quellen
Aufsatz (Konferenz)
Englisch
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