Thermoelectric Response Characteristics Of Hot Wire For Wind Measurement Under Low Reynolds Number And Multiple Field Disturbance Conditions

In accordance with relevant national policies such as the "Guiding Opinions on Accelerating the Development of Intelligent Coal Mines" and the "Guidelines for the Intelligent Construction of Coal Mines of the National Energy Group",my country's coal mining enterprises are actively promoting the construction of accurate warnings for major disasters and intelligent ventilation systems.Real-time perception and accurate prediction of mine ventilation status is the prerequisite and guarantee for the intelligent upgrade and transformation of mine ventilation systems.Therefore,the research and development of high-precision anti-interference self-calibration wind measurement methods suitable for mine climatic conditions has important theoretical research value and practical application significance.Based on a comprehensive investigation of the latest research progress of wind measurement methods at home and abroad and a comparative analysis of existing pipeline wind speed detection technologies,this thesis selects thermal wind measurement methods as the research object,and uses a variety of research such as theoretical analysis,modeling simulation,and experimental testing.Means,the research on hot-wire wind speed perception model and accurate wind measurement method has been carried out.The main research contents are as follows:(1)Mesoscopic flow model of intrusive hot wire wind measurement in low Reynolds number flow field: Based on the principle of constant temperature hot wire wind speed measurement,a three-dimensional simulation model of typical thermal wind sensor intervention in ventilation shafts is established,and fluid-solid coupling is proposed.The mathematical description,constraint conditions and numerical solution methods of the gas flow problem,the fine reconstruction of the low Reynolds number swept flow characteristics in the wind measurement microchannel and the turbulence characteristics of the external field of the detection element,and the analysis of the relationship between the flow velocity at the leading edge of the hot wire stagnation point and the mainstream wind velocity in the tunnel Non-linear correspondence relationship,the actual wind speed characteristic response curve and hierarchical correction model of the internal and external field of the actual wind measuring device are obtained.(2)The apparent convective heat transfer characteristics of the constant temperature hot wire under thermodynamic disturbance: the heat-mass transport model and the solution method of the constant temperature hot wire swept flow under the coupling effect of flow-heat-solid interaction are established,based on the actual climatic characteristics of the roadway.The thermodynamic state description method of ventilation parameters is modeled and deduced.The influence of thermodynamic factors such as temperature change,composition and high humidity on the apparent convective heat transfer characteristics of the wind measurement hotline is studied,and the intensity and intensity of multi-field disturbances under mine climate conditions are obtained.Non-linear criterion equation between the heat exchange.(3)The thermoelectric response mechanism and compensation algorithm of the wind measuring hot wire: Based on the feedback control principle,the static linear and dynamic nonlinear equations of the hot wire sensor are derived,and the transient current and voltage of the main thermal components in the constant temperature hot wire wind measuring system are studied.The change law,the influence of ventilation thermodynamics on the response characteristics of the hot wire is analyzed,the thermoelectric response compensation algorithm under the multi-field disturbance of the mine climate is proposed,the integrated wind measurement error of the hot wire sensor is discussed,and the output signal correction model is established.Based on the research results of multi-field coupling characteristics of hot-wire wind measurement under low Reynolds number flow field and thermodynamic disturbance conditions,the research level of accurate sensing methods for mine ventilation status is improved,and high-precision anti-interference self-calibration wind measurement technology and equipment for mines can be further developed.,Realize the accurate monitoring of mine ventilation parameters and make it have the applicable ability to respond to the complex ventilation conditions of the mine.The article has 44 pictures,12 tables,and 88 references.