Step-by-step incremental method for bottom pressure measurement of hypersonic model

• Main Authors: YU SHI'EN, LIU FENG, LIN QI, QING LONG, PU XUYANG, DING GUOHAO, MAO XIONGBING, LIU JIANXIA, ZHANG XIAOQING, ZHAI XIAOFEI
• Format: Patent
• Language: Chinese; English
• Published: 26.11.2019
• Subjects: MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

The invention provides a step-by-step incremental method for bottom pressure measurement of a hypersonic model. The method comprises the following steps: step one, before a bottom pressure measurementtest of a hypersonic model, pumping a test section to be in a vacuum degree, measuring a vacuum degree, and expressing the vacuum degree by an absolute pressure Pv; step two, starting to carry out hypersonic model bottom pressure measurement testing and measuring a bottom pressure increment delta p of the hypersonic model in the testing process; and step three, acquiring a hypersonic model bottompressure Pb according to a formula: Pb=Pv+deltap. Therefore, the system errors can be eliminated effectively; the random errors can be reduced; and the reliability and overall accuracy of bottom pressure measurement can be improved substantially. 本发明提供一种用于高超声速模型底部压力测量的分步增量法，包括如下步骤：1：高超声速模型底部压力测量试验前，将试验段抽吸至真空，测量真空度并用绝压p表示；2：开始进行高超声速模型底部压力测量试验，试验过程中测量高超声速模型底部压力增量Δp；3：根据公式p＝p+Δp，得到高超声速模型底部压力p，本发明分步增量法能够有效地消除系统误差、减小随机误差，能够大幅提