关键词: 多孔介质, 产品设计, Monte Carlo模拟, 压力损失, 压降, 阻力

Abstract:

Heat exchanger is the fundamental equipment of industry, which is important for the air vehicle, widely used in engine and ECS subsystem which is needed for it. The heat exchangers are usually used for passenger safety and comfort, which is also the important device for other equipment to keep normal and efficient work. The references of heat exchanger design and hydrodynamics have been contrasted and analyzed, some concepts and definitions are different from each other, the engineering calculation expressions of pressure characteristic of plate-fin heat exchangers have been put forward on the basis of hydrodynamics. One type of offset strip fin has been chosen for air-air heat exchanger, the one-pass and two-pass heat exchanger was set, which contained sudden expansion and contraction and 90°^{elbow and 180° elbow for the local pressure drop computation, the heat transfer is not considered, the Halton sequence is used for quasi-Monte Carlo, which is for heat exchanger at some temperature and pressure and Re outlet conditions computation, the probabilistic analysis is worked for the conclusions. As the two kinds of calculation examples shown, the header pressure loss and drop are little part to total heat exchanger pressure drop at most conditions, and the most probability density is about 0.05, the ratios of the total pressure drops to outlet pressures are very little, the constant pressure can be used for calculation of the fluids property.}

Key words: porous media, product design, Monte Carlo simulation, pressure loss, pressure drop, resistance