采用双毛细管等流量法测量航空煤油RP-3的动力黏度

发布时间：2019-02-11 14:19

【摘要】：为实现超临界压力下航空煤油RP-3的动力黏度测量,在原双毛细管黏度计对比计算法基础上,采用等流量法并引入离心力修正系数对测试段毛细管压降进行修正,测量压力可达10MPa,测量温度范围提高至306.6~673.4K。等流量法根据上下游毛细管质量流量相等,通过测试流体在上下游毛细管中的压降关系及下游测试段毛细管热膨胀系数推算出该流体动力黏度。该方法简便可靠,在所测温度范围内的相对标准不确定度为1.16%~2.92%。通过纯物质十二烷及质量比为1∶1的正辛烷正庚烷二元混合物对等流量法进行标定,试验结果与文献值的相对偏差在±2.18%以内,相对偏差绝对平均值小于0.74%。在压力为3、4、5 MPa,温度为306.6~673.5K的条件下,采用该方法测量了航空煤油RP-3的动力黏度。该方法的应用可为进一步提高超临界航空煤油动力黏度的测量温度范围创造条件。
[Abstract]:In order to measure the dynamic viscosity of aviation kerosene (RP-3) under supercritical pressure, the capillary pressure drop in the test section is modified by the constant flow method and the centrifugal force correction coefficient, based on the comparison calculation method of the original double capillary viscometer. The measuring pressure can reach 10MPa, and the temperature range can be raised to 306.6n 673.4k. According to the equal mass flow rate of the upstream and downstream capillary, the dynamic viscosity of the fluid was calculated by measuring the pressure drop relation of the fluid in the upstream and downstream capillary and the coefficient of thermal expansion of the capillary in the downstream test section. The method is simple and reliable, and the relative standard uncertainty is 1.162.92 in the range of measured temperature. The isothermal flow rate method of n-octane n-heptane binary mixture with a pure substance dodecane and 1:1 mass ratio was used to calibrate. The relative deviation between the experimental results and the literature value was within 卤2.18%, and the absolute average of the relative deviation was less than 0.74%. The dynamic viscosity of aviation kerosene RP-3 was measured by this method under the pressure of 3? 4? 5 MPa,? The application of this method can create conditions for further improving the temperature range of dynamic viscosity measurement of supercritical aviation kerosene.
【作者单位】：西安交通大学动力工程多相流国家重点实验室;
【基金】：国家自然科学基金资助项目(21306147)
【分类号】：TE626.22

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