, ;where δ – the thickness of the second metal crust formed on the part surface over a period of time (τp – τ1) when expulsion in a crystallizing me τ1 – time of removal of the first crust; τp – the end time of the expulsion; L is the heat of crystallization; ρ – density of molten metal; Tcr – temperature of melt crystallization and Tv – temperature of the cooling medium.;EFFECT: improving the accuracy of heat transfer coefficient determination in convective cooled parts.;1 cl, 2 dwg"/>
METHOD FOR DETERMINING THE HEAT TRANSFER COEFFICIENT THROUGH THE WALL OF A CONVECTIVE COOL PART
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METHOD FOR DETERMINING THE HEAT TRANSFER COEFFICIENT THROUGH THE WALL OF A CONVECTIVE COOL PART
METHOD FOR DETERMINING THE HEAT TRANSFER COEFFICIENT THROUGH THE WALL OF A CONVECTIVE COOL PART
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机译：确定对流冷却部件壁面传热系数的方法
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摘要
FIELD: measurement technology.;SUBSTANCE: invention relates to thermophysical measurements and is intended to determining heat transfer coefficient in convectively cooled parts, for example, in gas turbine blades. A method for determining the heat transfer coefficient through a wall of a convectively cooled part is proposed, including immersion of investigated part into a melt of a high-heat-conducting metal overheated above its crystallization temperature, cooling the melt and the part to a crystallization temperature, expulsion of the part with a cooling medium with measuring the time of expulsion and the temperature of the medium at the entrance to the part, removing it from the melt and measuring the thickness of solidified metal crust with the subsequent calculation of the heat transfer coefficient. Moreover, in the part testing process when it is in the melt at the time τ1 remove the first crust, and τ1≥τc, where τc – stabilization time of temperature of the cooling medium at the entrance to the part. At the end of expulsion at time τP after extracting the part, thickness of the second crust is measured, then heat transfer coefficient is determined by the formula ; , ;where δ – the thickness of the second metal crust formed on the part surface over a period of time (τp – τ1) when expulsion in a crystallizing me τ1 – time of removal of the first crust; τp – the end time of the expulsion; L is the heat of crystallization; ρ – density of molten metal; Tcr – temperature of melt crystallization and Tv – temperature of the cooling medium.;EFFECT: improving the accuracy of heat transfer coefficient determination in convective cooled parts.;1 cl, 2 dwg
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机译：技术领域本发明涉及热物理测量，并且旨在确定对流冷却的零件（例如，燃气涡轮叶片）中的传热系数。提出了一种确定通过对流冷却部件壁的传热系数的方法，该方法包括将被研究部件浸入到高于其结晶温度而过热的高导热金属的熔体中，将其冷却并冷却至结晶状态。温度，通过冷却介质将零件排出，通过测量排出时间和零件入口处的介质温度，将其从熔体中除去，并测量凝固的金属外壳厚度，并随后计算传热系数。此外，在零件测试过程中，当在τ 1 时处于熔融状态时，除去第一个外壳，并且τ 1 ≥τ c ，其中τ c –零件入口处冷却介质温度的稳定时间。抽出零件后，在时间τ P 的排出结束时，测量第二个地壳的厚度，然后由公式确定传热系数; ，其中δ–在零件表面上形成的第二金属外壳的厚度在结晶熔体中排出时的时间段（τ p –τ 1 ）; τ 1 –去除第一块皮的时间; τ p –驱逐的结束时间; L是结晶热; ρ–熔融金属的密度; T cr –熔体结晶温度，T v –冷却介质温度。;效果：提高对流冷却零件传热系数的确定精度。1cl ，2载重吨
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