Canopy Heat Transfer Numerical Simulation Of High And Low Temperature Fatigue Test And Thermal Economic Analysis

This paper uses the current Canopy Temperature & Load Fatigue Test-Bet in Chengdu Aircraft Design and Research Institute as research object, and is spread out surrounding the problem of high energy-consumption. Neither the complex construction of pipeline nor variable properties of fluid with low velocity in the paper are universal existences in general engineering practices on heat transfer. This paper describes a numerical simulation method used to resolve coupled unsteady convective and conductive problem in pipeline. Not only is the method applied in this paper better to solve the iteration between unsteady convection and conduction and the boundary condition problem, but also is a developmental application on forward and backward difference of windward scheme under unsteady condition. By computing on the typical example curves, find out the laws of temperature change of pipeline elements and the fluid under the unsteady condition. Meanwhile, the laws of energy consumption varying with temperature (or time) are studied relatively. And find out high energy-saved element and energy consumption states of pipeline elements by analyzing the computation results. Hereby, put forward a scheme, spraying a layer of insulating material onto metal wall inside pipeline, used to economize on energy. And have a thermal-economics analysis with satisfactory results. By computing on the real test temperature load-curves, the relationship of energy consumption with temperature (or time), along with theoretical energy values, is obtained. The results of comparison between energy consumption values from theoretical computation and those from actual test show that the error of single test- curve is less than 11% and the total error for 100 flight-hour is less than 20%. And the energy-saved scheme gives us an exciting result in the way of energy saving. Thus, the study is not only completed for first time at home, but also has an actual directive significance to the same kind of test-bet on aspects of analyzing thermal- economics, optimizing test running-parameter and decreasing test cost.