发动机支点柔性圆周炭石墨密封材料PV值试验

根据高空长航时航空发动机支点柔性圆周炭石墨密封材料的实际服役工况，从高摩擦线速度（60～130 m/s）、轻载（30～400 kPa）和温度（25～600 ℃）的角度出发，自主设计动态试验测试台，评测国内部分现役机型用炭石墨密封材料的PV值，并通过装机论证PV值试验的可行性。试验结果表明:采用80 m/s恒速，逐级增加载荷测得XX1#-1、XX2#-1、XX3#-1、XX4#-1和XX5#-1的许用PV]值分别为4.8、5.9、6.9、9.1、12.3 MPa·m/s。采用300 kPa定载，逐级增加线速度测得XX2#-2、XX3#-2、XX4#-2和XX5#-2的许用PV]值分别为6.0、8.0、10.0、12.0 MPa·m/s。经某研究所装机论证发现当试验样的许用PV]值小于发动机的许用PV]值时，易出现异常磨损，并伴随燃气泄漏；当试验样的许用PV]值大于发动机的许用PV]值时，能为发动机支点炭石墨密封材料选型提供材料特性数据，为发动机炭石墨密封材料的研究提供鉴别方法。此外，该试验方法将大大节约发动机用石墨封严材料选型的时间成本、人力成本和上机论证经费的投入成本。 

Experiment on PV value of fulcrum flexible circumferential carbon graphite sealing material for engine

In order to evaluate the PV value of the carbon graphite sealing material used in the aero-engines of some current models at home, the dynamic test bench was independently designed according to the actual service conditions of the fulcrum flexible circumferential carbon graphite sealing material for engine at high altitude-long endurance, under the condition of high friction linear velocity (60 ? 130 m/s), light load (30 ? 400 kPa) and temperature (25 ? 600 ℃). The test results showed that the allowable PV] values of XX1#-1, XX2#-1, XX3#-1, XX4#-1 and XX5#-1, using a constant speed of 80 m/s and gradually increasing the load, were 4.8, 5.9, 6.9, 9.1, 12.3 MPa·m/s, respectively. The allowable PV] values of XX2#-2, XX3#-2, XX4#-2 and XX5#-2, using a permanent load of 300 kPa and increasing the linear velocity step by step, were 6.0, 8.0, 10.0 and 12.0 MPa·m/s, respectively. The installation demonstration of an institute found that the test samples were prone to abnormal wear and gas leakage, when the allowable PV] value of the test sample was less than the allowable PV] value of the engine. When the allowable PV] value of the test sample was greater than the allowable PV] value of the engine, this method can not only provide material characteristic data for selection of the engine fulcrum carbon graphite sealing material, but also contribute to the research of the engine carbon graphite sealing material identification method. In addition, the time cost, labor cost and installation demonstration cost of graphite sealing material selection for engine will be also greatly reduced through this test method.