Device and method for measuring convective heat transfer coefficient of aviation fuel tank

Abstract

The application belongs to the field of heat transfer of aviation fuel tanks, and in particular relates to a measuring device and method for the convective heat transfer coefficient of aviation fuel tanks. The device includes a frame, a screw rod, a pressurized block, an upper pressing head, a lower pressing head and a heating block. The frame includes a U-shaped bracket and a bottom plate; the upper end of the screw passes through the first through hole of the U-shaped bracket and is fixed by two bolts; the pressurized block is sleeved on the screw through the second through hole; a thermocouple is installed on the upper pressure head , the upper end of the upper pressing head is provided with a blind hole, and the lower end of the screw rod is arranged in the blind hole of the upper pressing head after passing through the second through hole of the pressurizing block, and the lower end of the upper pressing head covers A sealing ring is provided; a thermocouple is installed on the lower pressure head, an oil groove is provided at the upper end of the lower pressure head, and oil is filled in the oil groove, and the lower end of the upper pressure head is arranged in the oil groove, and is connected with the The upper liquid surface of the oil is in contact; a thermocouple is installed on the heating block; the lower pressure head and the heating block are fixed to the bottom plate through a clamp.

Description

technical field [0001] The application belongs to the field of heat transfer of aviation fuel tanks, and in particular relates to a measuring device and method for the convective heat transfer coefficient of aviation fuel tanks. Background technique [0002] At present, with the development of aerospace technology, the flight speed of aircraft is getting faster and faster. The fuel tank heat protection system must not only bear the external aerodynamic heating but also maintain the low temperature environment of the internal fuel. The accurate calculation of the heat transfer of the fuel tank is an important guide for the structural design of the fuel tank. significance. Among them, the convective heat transfer coefficient between the oil and the fuel tank is the key to the heat transfer calculation, and it is also one of the difficulties in the thermal analysis of the fuel tank; during the flight, the fuel tank and the external atmospheric pressure maintain a stable pressur...

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Problems solved by technology

[0003] At present, the calculation methods of convective heat transfer coefficient in engineering include theoretical analysis methods, experimental measurement methods, and numerical calculation methods. Among them, theoretical methods cannot complete the calculation of complex models. Numerical calculations need to consume huge time and computing resources at this stage. Experimental measurement The method has become the current mainstream method, but the existing convective heat transfer coefficient measurement test is complicated to operate, takes a long time, the test cost is high, and the test data processing is cumbersome, and the relationship between pressure, temperature and convective heat transfer coefficient cannot be measured at the same time. It is not conducive to accurate and rapid evaluation of the heat transfer performance of aircraft fuel tanks

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