基于超声波时差法的矿用换能器安装位置研究

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中图分类号：TD724 文献标志码：A

Installation positions of mine ultrasonic transducers based on ultrasonic time difference method

MAYunfei1，ZHOUChunshan1，CHENGXiyu1，YUFangchao²

CollegeofSafetyandEmergencyManagementEngineering，TaiyuanUniversityofTechnology，Jinzhong（

China；2.Wangzhuang Coal Mine，Shanxi Lu'an Environmental Protection Energy Development Co.，Ltd.，

Changzhi 046032，China）

Abstract：To address the limitation in measurement accuracy of existing ultrasonic time difference anemometry caused bythe inabilityof transducer installation positions to dynamically adaptto different roadway cross-sections，this studyinvestigatedtwoultrasonic transducer installationpositions fordiferentroadwaycrosssections （suchasrectangle，trapezoid，arch，etal）.Fluent numerical simulationsand underground manual measurements wereconducted toverifytheexistenceofanaverage wind velocity line paralel totheroadway floor.On this basis，bycombining turbulent stress decomposition theory with Prandtl's mixing length theoryand introducingamodified coeficient，the height function of the average wind speed line from the roadway floor for differentroadwaysectionswas derived.Together withthe determinationof thevelocity measurementinterval， the installation positions of the twoultrasonic transducers were determined.Simulationand field testresults showed that： ① compared with the traditional fixed-height transducer installation method，the proposed transducer installation position determination method achieved higher measurement accuracy under thesame operating conditions. ② The installed transducers performed best in rectangular roadways，with arelative error of 4.486% （204号 compared with manual measurements，followed by arched roadwayswith arelative error of 4.935% ，while trapezoidal roadways showed the largest relative error of 5.579% ： ③ Using standard deviation as the evaluation criterionrsingstandard deviationas the evaluationcriterion，the standard deviationofwind velocity measurements obtained by the installed ultrasonic transducers was smaller than that of manual measurements，indicating more stable data acquisition in underground environments.

Key words： ultrasonic time difference method;mine ultrasonic transducers; wind velocity measurement measurement line; average wind velocity line ofroadway cross-section; wind velocity of roadway cross-section

0引言

在煤矿生产过程中，矿井的有效通风是保障井下作业安全、预防瓦斯积聚、控制粉尘扩散和降低温度及湿度的关键环节。（剩余13890字）