The Comprex pressure-wave machine is well qualified for
supercharging automotive Diesel engines, demonstrating as it does,
improvements in power output, fuel consumption and emissions. The
special form of the charging characteristics is established from
theoretical considerations of the pressure wave compression
process.
Data from the currently available production machines show, with
the aid of supercharging parameters, such a pressure ratio, density
ratio and adiabatic compression efficiency, the operating limits of
the machine with respect to cell filling and pressure-wave
tuning.
A computer program, interpolating from measured data and using a
simplified model of the engine, allows optimisation of an
installation considering Comprex type, shaft drive ratio, charge
air cooling and control system functions.
The correlation of the program with measured values is adequate
for the purpose of engine-to-Comprex matching.