柴油机废气涡轮增压蜗壳冷却流场及工作过程仿真研究-动力机械及工程专业论文 word格式.docx

关键词:柴油机,废气涡轮增压,蜗壳冷却,流场,仿真研究
The Study of the Cooling Flow Field and the Work Process Simulation on the Diesel Turbocharger diffuser cooling Abstract
Plateau turbocharged diesel engine with waste gas mon exist air cooling not
fully,power output is not ideal, the heat load and exhaust temperature is higher. The article aiming at this issue, based on the former research put forward the concept of the volute cooling. Applicate in CFX software to simulation the air flow pressor, and verification the correctness of the simulation method through parison with the test results;In this premise design water-cooled diffuser, copper pipe cooling, ring inter-cooled device and simulation it’s air flow field;By the software of GT-POWER, with the case of bafore and after cooling exit area average pressure and temperature for environment parameters to simulation and analysis the change of performance of diesel shows that volute cooling can effectively solve the problem in plateau turbocharged diesel engine with waste gas.
Taking a inline-four diesel engine which have waste gas turbocharge and inter-pressor as an example, use the fluid dynamics CFX software established pressor flow field simulation model. Assume the physical model inside pressor is three-dimension, steady-state, none internal heat source pressible fluid turbulent flow and heat transfer. The method of using unstructured grids discrete calculation domain, in order to rule out the number of grid for the correctness of the simulation calculation results interference, the paper study the grid has nothing to do the parison with experimental results to verify the correctness of the simulation calculation method.
According to the calculation analysis to the simulation model pressor, the paper designs copper pipe cooling, water-cooled diffuser, ring inter-cooled device and simulation copper pipe cooling and water-cooled diffuser(with the pressor simulation model) air flow field. Using the metho