The pre-mixer model of new intake manifold system application for multi-fuel spark ignitionengine by numerical investigation and comparison

摘要

This paper is to study about the development of variable intake manifold for spark ignition engine. Variable intake manifold by numerical is one of the methods in optimizing the performance of an engine when changing or mixing fuel. It has been found that the geometric of new multi fuel intake system configurations of spark ignition engine plays a vital role in engine performance. The main aims of the paper are to assess the comprised thermal efficiency and numerical engine performances for the multi fuel small spark ignition engine of modified intake system unit. This engine type is unique, entirely conceived by the author and has not previously been reported in the open literatures. It is called the pre mixer of multi fuel and air. It was compared with the old intake manifold system of fuel injectors [8] and carburetor [10]. It makes this system can adjust the fuel mixture, or a variety of gasoline with ethanol, that aimed at engine improvements through thermodynamic engine indicated power (kW) with the indicated mean effective pressure (IMEP) and thermal efficiency (%) withspecific fuel consumption (SEC, g/kW-hr) gains. The routine was written usingMATLAB-based procedure for determining at different operating condition suchas engine speed, equivalence ratio and compression ratio that describe the engineperformance. The effect of equivalence ratio is affecting the system changessignificantly of pre-mixer and carburetor with fuel injector in the thermalefficiency about 5-50%. The effect of compression ratio is affecting the systemchanges significantly of pre-mixer with carburetor and fuel injector for thethermal efficiency and SFC.