Investigation of the relationship between fuel injection nozzle roto flow and hydra flow and the engine torque of a diesel engine.

摘要

The purpose of this study was to investigate the possibility of reducing diesel engine torque variation by controlling fuel injection nozzle tip configuration. In order to reduce engine torque variation, test runs were conducted to determine whether fuel injection nozzles effected diesel engine torque. There was a further effort to determine whether a correlation existed between the fuel injection nozzle roto flow and hydra flow, and the engine torque at specified engine speeds.; The researcher identified engines installed in cotton pickers and tractors for this study. The investigation consisted of two limited-time production style tests. One test was without restrictions and the other was with restrictions.; Two-way ANOVA and correlation statistical procedures were used for the following purposes: (1) Investigate the effect of different levels of nozzle roto flow and hydra flow on engine torque. (2) Identify the difference between the effect of nozzle roto flow and hydra flow on engine torque and that of chance variables. (3) Determine the Pearson's correlation coefficient r between nozzle roto flow and hydra flow and engine torque at each engine speed. (4) Develop linear equations between nozzle roto flow and hydra flow and engine torque at each specified engine speed.; The statistical analyses indicated that different levels of fuel injection nozzle roto flow and hydra flow significantly affected diesel engine torque, which was independent of engine speed. There was a significant positive correlation which was greater than 0.94 at each tested engine speed between nozzle roto flow and hydra flow and diesel engine torque. Linear equations between nozzle roto flow and hydra flow and the engine torque at each specified engine speed were developed.; For cotton picker and tractor engines, a precise prediction of engine torque from a specific fuel injection nozzle roto flow or hydra flow can be calculated directly from the equations resulting from this study. The findings could also help engine manufacturers effectively choose the optimum required fuel injection nozzle roto flow or hydra flow, based on the nominal torque which could further control the engine torque variation.