同軸直旋混合射流噴嘴結(jié)構(gòu)參數(shù)優(yōu)化的數(shù)值模擬研究
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關(guān)鍵詞：水射流；煤層氣；直旋混合射流；徑向鉆井
中圖分類號：TE921 文獻(xiàn)標(biāo)志碼：A 文章編號：1003-5168（2025）07-0027-07
DOI： 10.19968/j.cnki.hnkj.1003-5168.2025.07.006
Numerical Simulation of Structure Optimization of Coaxial Straightswirling Mixed JetNozzle
PENG Zhao DU Peng （School of Mechanical Engineering，Anhui University ofScience and Technology，Huainan 232O01，China）
Abstract：[Purposes] This paper aims to determine the reasonable parameters for the straight-swirling mixed jetdrill bit.[Methods] In this paper，numerical simulation software such as ANSYS and Fluent is used to studythe flow field characteristicsof coaxial direct swirl mixed jetbyusing the control variable method，and the influence law of the key structural parameters of the bit （direct swirl flow ratio slot aspect ratio ， mixed cavity length-diameter ratio linear section length-diameter ratio ） on the flow field is analyzed.[Findings] affects the distribution ratio of direct flow and rotating jet， and mainly affects the spinning energy of rotating jet.[Conclusions] It can be concluded that the flow field suitable for self-feeding driling canbe obtainedby adjusting the bit structure.Taking the axial velocity and radial distribution of the jet as evaluation indexes，the optimal parameters of the bit are： =0.46，d/d =0.67， =0.56，providing engineering guidance for radial drilling construction. Keywords： water jet; coal bed methane; straight-swirling mixed jet; radial drilling
0引言
自進(jìn)式直旋混合射流是將直射流和旋轉(zhuǎn)射流相結(jié)合的組合射流[1-2]，有效地結(jié)合了兩者的優(yōu)點(diǎn)，噴射能量分布均勻，鉆探孔徑較大，有效破巖距離長，尺寸小，結(jié)構(gòu)簡單，且避免了形狀不均勻，偏離預(yù)定角度的問題。（剩余3812字）