Equivalent verification test method for reliability of thermal protection coating under high-temperature, high-pressure and high-frequency working conditions
A high-temperature, high-pressure, verification test technology, applied in the field of effectiveness verification test, can solve problems such as long heating cycle, difficulty in simulating high temperature, high pressure, high frequency heat transfer conditions, and uneven temperature distribution, so as to reduce test cost and ensure reliable The effect of increasing reliability and speeding up the experiment process
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[0069] This embodiment is a heat protection coating for the following working conditions: the coating material is yttria-stabilized zirconia (8YSZ), with a thickness of 2.0 mm, and is located on the top surface of the piston in the combustion chamber. The gas temperature is 1300K, the instantaneous deflagration pressure is 30MPa, the engine speed is 1500r / min, and the gas heat transfer coefficient is 1585W / (m 2 · K).
[0070] pass figure 1 The shown heat transfer calculation and bending stress calculation, the process is as follows:
[0071] Collect engine heat protection coating thickness, gas temperature T ∞ , initial piston temperature T 0 , the instantaneous deflagration pressure P (used to calculate the sample size), the engine speed n (used to obtain the heat transfer time t, the loading frequency, and then obtain the Fourier number), and the heat transfer coefficient h, consult the data to find 8YSZ The modulus of elasticity, thermal conductivity λ and coefficient o...
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