Modeling and Simulation of Turbulence Induced In-Nozzle Cavitation in a Heavy Duty Diesel Engine

Abstract

Heavy duty diesel engines have many applications like in cranes, electrical power generation, ships, marine, planes and in heavy industry. To have efficient combustion there for the environment should be healthy and fuel consumption should be optimized we have to achieve efficient combustion. Injector nozzles are the main source of fuel injection into the combustion chamber. If more fuel is sent into the combustion chamber it will not be completely burnt and the environment will be polluted. Over the time the environment will not be healthy. Other side of the picture is that more fuel is wasted which could have taken part in giving the useful amount of work. In Pakistan the injector nozzle are not manufactured which is a very significant drawback. So the study will be focused on internal flow dynamics of the injector nozzle. The nozzle was modeled on Solid Works 2016 and was then imported into the very know tool for predicting flow i.e. Ansys. In Ansys meshing was done and then at different pressure sets results were obtained. Before moving on to the injector nozzle at first the technique was validated. The results obtained during validation were very satisfying and motivated to complete the study for our injector. The 3-D injector nozzle which was imported on Ansys went through number of simulations to generate data sets. Resulting in predicting the behavior of the spray. Moreover a matlab code was developed for plotting the data sets generated which can show us the trend of the spray at different pressure differences. Proceeding ahead in the thesis will clarify much more.