طراحي و بهينه سازي پس خنك كن سامانه پرخوراني موتورهاي احتراق داخلي بر پايه الگوريتم ژنتيك

Design and Optimization of an Internal Combustion Engine Intercooler based on Genetic Algorithm

اين مقاله در پي يافتن بهترين چيدمان هندسي براي پس‌خنك‌كن سامانه پرخوراني يك موتور احتراق داخلي است تا كمترين افت فشار و هزينه ساخت و بيشترين كاهش دما براي هواي عبوري از مبدل حاصل گردد. براي اين منظور يك مبدل نوار و صفحه در نظر گرفته شده و پس از استخراج تمامي معادلات و تعريف تابع هدف مناسب، بهينه سازي با روش الگوريتم ژنتيك و بصورت تحليلي انجام مي‌شود. نتايج نشان مي‌دهندكه پس‌خنك‌كن طراحي شده ضمن داشتن وزن مناسب و افت فشار بسيار كم، دماي هواي ورودي به موتور را به ميزان قابل قبول براي ورود به موتور مي‌رساند.

Increasing the volumetric efficiency of internal combustion engines has always been one of the goals of the engine designers. Utilizing turbocharged systems is one of the common ways to achieve this aim. In these systems, compact heat exchangers are used to reduce the temperature and increase the density of the air at the outlet of compressor. This article seeks out the best geometric layout for an intercooler to have the lowest pressure drop and the highest temperature decrease of the passing air through the heat exchanger and at the same time leads to the lowest manufacturing cost. To obtain this purpose, a bar and plate heat exchanger is considered and after deriving all the geometric, flow and thermal equations, a comprehensive objective function is defined. Then, using the genetic algorithm method and considering six design variables, the best design values for variables are found to maximize the objective function. All calculations are done analytically and using coding in MATLAB software. The results show that the designed intercooler beside an appropriate weight and a very low pressure drop, reduce the engine inlet air temperature significantly and brings it to an acceptable level to enter the engine.