A mathematical model of the injection pump was set up and its working characteristic was simulated using numerical computation method

the experiment apparatus was constructed and RP-3 fuel was adopted as the working fluid to verify the validity of this model. The flow ratio under various operating pressures was calculated from -40 degree to 40 degree by employing RP-3 fuel and JET-A fuel as working fluids

respectively. Result shows that if the fuel's temperature is above 0 degree

the effect of the fuel temperature on the working characteristic of injection pumps can be ignored. However

with the decrease of the temperature

the deviation of the performance with that at standard temperature(20 degree) increases definitely

especially the pressure ratio is high. When the temperature is above 0 degree

the performance of injection pump using RP-3 fuel is slightly better than that using JET-A fuel

but if the temperature is extremely low

the performance using RP-3 fuel is much better than that using JET-A fuel. It can be concluded that when the temperature is low and the pressure ratio is high

the effect caused by the temperature on the performance of injection pump should be considered carefully.