本文選題：初始釋放瓦斯膨脹能 + 測定裝置　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：初始釋放瓦斯膨脹能預(yù)測法為現(xiàn)場定量預(yù)測煤層的突出危險性提供了一套全新的方法,正確選擇漸縮形噴口有效截面積S值的測定方法對測定結(jié)果的精確度有著重要影響。原先采用氣容放氣法測定S值只適用于氣流通過漸縮形噴口處于音速階段時初始釋放瓦斯膨脹能的計算,而氣流通過漸縮形噴口的過程分為音速與亞音速兩個階段,但以往卻將兩個階段的S值做同一值而論。針對這一問題,本文提出一種測定S值的新方法,其實質(zhì)就是通過測定漸縮形噴口的流量特性相關(guān)參數(shù)去間接求取S值,彌補了原先測定方法的不足,進而有利于實現(xiàn)初始釋放瓦斯膨脹能測定結(jié)果的精確化。本文的主要研究工作從以下三個方面著手:首先分析研究漸縮形噴口的流量特性及其測試方法,包括影響流量特性的因素,表示流量特性的幾種常用方法,以及各個參數(shù)的測試方法;然后設(shè)計一套測試系統(tǒng),給出詳細的設(shè)計過程;最后利用設(shè)計好的測試系統(tǒng)對漸縮形噴口流量特性的相關(guān)參數(shù)進行測定,利用這些測定的參數(shù)求取有效截面積S值,同時采用原先的氣容放氣法測定S值,并對兩種方法測定得到的S值進行比較分析。通過以上的研究工作,得到以下成果:(1)提出了一種測定漸縮形噴口有效截面積S值的新方法,通過測定漸縮形噴口的流量特性各個參數(shù)分別得到了音速與亞音速兩個階段的S值;(2)設(shè)計了一套基于國際標(biāo)準(zhǔn)測試方法并結(jié)合計算機數(shù)據(jù)采集的測試系統(tǒng),能夠準(zhǔn)確測定漸縮形噴口的流量特性各個參數(shù);(3)測定了漸縮形噴口的臨界壓力比b值為0.284,并根據(jù)b值準(zhǔn)確劃分了氣流通過漸縮形噴口時的音速與亞音速階段;(4)得到了漸縮形噴口的有效截面積S值在音速與亞音速階段分別為2.87mm2與2.33mm2,用原先方法測定了S值為2.70mm2,并將兩種測定方法進行了比較分析,突出新方法適用性更強的優(yōu)點。
[Abstract]:The prediction method of initial gas release expansion energy provides a new method for quantitative prediction of coal seam outburst risk. The correct selection of effective cross section S value of tapered nozzle has an important influence on the accuracy of the measurement results. Previously, the measurement of S value by gas volumetric discharge method was only applicable to the calculation of the initial gas expansion energy when the air flow passed through the tapered nozzle at the sonic stage, while the gas flow passing through the tapered nozzle was divided into two stages: sonic and subsonic. But in the past, the S value of the two stages was treated as the same value. In order to solve this problem, a new method for measuring S value is put forward in this paper. The essence of the method is to obtain the S value indirectly by measuring the parameters related to the flow characteristics of the tapered nozzle, which makes up for the deficiency of the original measurement method. Thus, it is helpful to realize the accuracy of the measurement results of the initial gas release expansion energy. The main research work of this paper is as follows: firstly, the flow characteristics of the tapered nozzle and its testing methods are analyzed, including the factors affecting the flow characteristics, and several common methods to express the flow characteristics. And the test method of each parameter; then design a set of test system, give the detailed design process; finally, use the designed test system to measure the relevant parameters of the flow characteristic of the tapered nozzle, The effective cross sectional area S value was obtained by using these parameters, and S value was measured by the original gas volumetric discharge method. The S values obtained by the two methods were compared and analyzed. Through the above research work, the following results are obtained: 1) A new method for determining the effective cross section area S of tapered nozzle is proposed. By measuring the flow characteristics of tapered nozzle, the S value of sonic and subsonic stages is obtained, respectively. A test system based on international standard testing method and computer data acquisition is designed. The critical pressure ratio b of the tapered nozzle is determined to be 0.284, and the sonic and subsonic stages of airflow passing through the tapered nozzle are accurately divided according to the b value. When the effective cross sectional area S of the tapered nozzle is 2.87mm2 and 2.33 mm 2 at the sonic and subsonic stages, the S value of the original method is 2.70 mm 2, and the two methods are compared and analyzed. The advantages of more applicability of the new method are highlighted.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD713.2

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