油介质钢-BFPC结合面的热特性分析

Thermal Characteristics of Steel-BFPC Interface Under Oil Medium

为了研究钢和玄武岩纤维树脂混凝土(BFPC)组成的结合面在油介质条件下的热特性,首先,利用离散原理来计算钢-BFPC结合面的实际接触面积,由于结合面接触时本质上是微凸体接触,微凸体会受到挤压形成挤压应力不同的面积区域,故进一步考虑接触比重,提高实际接触面积结果的精确性;然后,根据结合面的形貌特征,结合傅里叶定律分析油介质条件下钢-BFPC结合面的传热机理;最后,分别通过理论计算和实验研究分析不同载荷(0.2、0.4、0.6、0.8、1.0 MPa)对结合面热特性参数的影响.研究结果表明:接触热阻随着载荷增大而减小,传热系数和导热系数随着载荷增大而增大,不同载荷下,理论计算与实验计算的接触热阻误差分别为6.40%、6.18%、5.85%、4.61%、3.73%,接触热阻的误差随着载荷增大而减小.

In order to study the thermal characteristics of the interface composed of steel and basalt fiber polymer concrete(BFPC) under oil medium conditions,the discrete principle was first used to calculate the actual contact area of the steel-BFPC interface.Since the contact surface is essentially a micro convex contact,the micro convex body is subjected to certain extrusion,forming an area with different extrusion stresses.Therefore,the accuracy of the actual contact area was further improved while considering the specific gravity of contact.Then,based on the morphology characteristics of the interface and Fourier's law,the heat transfer mechanism of the steel-BFPC interface under oil medium conditions was analyzed.Finally,the influence of different loads(0.2,0.4,0.6,0.8,and 1.0 MPa) on the thermal characteristic parameters of the interface was analyzed through theoretical calculation and experimental research.The results show that with the increase in load,the contact thermal resistance decreases,and the heat transfer coefficient and thermal conductivity coefficient increase.Under different loads,the error of contact thermal resistance between theoretical calculation and experimental calculation is 6.40%,6.18%,5.85%,4.61%,and 3.73%,respectively.The error of contact thermal resistance decreases with increasing load.