To verify the feasibility of rock breakage with abrasive air jet, the effect of abrasive water jet and abrasive air jet on rock breaking is compared and analyzed. In this paper, the mechanism of abrasive acceleration in abrasive water jet and the abrasive air jet is theoretically investigated. The numerical relationship between abrasive kinetic energy and inlet pressure of abrasive water jet and the abrasive air jet is obtained. Based on the unified strength theory, the energy criterion for rock breaking by abrasive jet is established, and the critical energy required for rock failure is obtained. Based on the accelerated theory of abrasive and the critical energy of rock failure, the critical rock velocity and the required inlet pressure of rock are calculated. Based on the theoretical calculation results, the crushing effect of abrasive water jet and abrasive air jet on limestone erosion is studied experimentally. The results show that when the abrasive speed reaches 270 m/s, the required air jet pressure theoretical value is 15 MPa, the water jet pressure theoretical value is 45 MPa. Two kinds of abrasive jet erosion pits are shaped with “V” type. Compared with the abrasive air jet, the shape of the crater of abrasive water jet has the characteristics of “small mouth” and “deep pit”. The size of the erosion crater formed by the abrasive air jet is larger than that of the abrasive water jet.

中文翻译：

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磨料水射流和磨料空气射流的破岩压力比较

为了验证用磨料射流破碎岩石的可行性，比较并分析了磨料射流和磨料空气喷射对岩石破碎的影响。本文从理论上研究了磨料水射流和磨料空气射流中的磨料加速机理。得到了磨料动能与磨料水射流入口压力和磨料空气射流之间的数值关系。基于统一强度理论，建立了用磨料射流破碎岩石的能量准则，并获得了岩石破坏所需的临界能量。基于磨料的加速理论和岩石破坏的临界能量，计算了临界岩石速度和所需的岩石入口压力。根据理论计算结果，实验研究了磨料水射流和磨料空气射流对石灰石侵蚀的破碎作用。结果表明，当磨料速度达到270 m / s时，所需的空气喷射压力理论值为15 MPa，水喷射压力理论值为45 MPa。两种磨料射流腐蚀坑的形状为“ V”形。与喷砂嘴相比，喷砂坑的形状具有“小口”和“深坑”的特点。由磨料空气射流形成的侵蚀坑的尺寸大于磨料水射流的尺寸。两种磨料射流腐蚀坑的形状为“ V”形。与喷砂嘴相比，喷砂坑的形状具有“小口”和“深坑”的特点。由磨料空气射流形成的侵蚀坑的尺寸大于磨料水射流的尺寸。两种磨料射流腐蚀坑的形状为“ V”形。与喷砂嘴相比，喷砂坑的形状具有“小口”和“深坑”的特点。由磨料空气射流形成的侵蚀坑的尺寸大于磨料水射流的尺寸。