methane drainage borehole

Moreover the axial velocity component is very large at a small axial distance of 0-10 mm from the discharge port (when the he.

根据涡旋压缩机实际排气过程的特点,通过对物理模型的合理简化,建立了描述排气过程的准静态三维湍流流动数值模拟计算模型,对排气一周内不同动盘转角时刻中心腔内的流动分布及通过排气孔的流动进行了详细的数值分析。

The influence of area of discharge port on the performance and efficiency of scroll compressor is discussed.

研究了排气孔面积对涡旋压缩机性能和效率的影响,详细推导了排气孔理论开设区域的边界曲线方程。

Based the detail analysis for connection s relation of them a reasonable method select parameters was put forward and the range of discharge port in theory was presented.

详细分析了涡旋压缩机基本参数与圆弧型修正齿形结构性能之间的变化关系 ,提出了合理选择参数的思路 ,并从理论上给出了排气孔开设的范

The effects of terrace die air vent on the drawing process;

拉深凸模排气孔对零件成形的影响

Improving Growth of Street Trees by Boring the Rhizo$pheric Soil for Aeration

土壤钻孔通气法对行道树生长的改善

Study on the Measure of Boring in the Rhizospheric Soils to Aerate for Meliorating the Weak Growth Potential of the Urban Tree;

根际土壤实施钻孔通气法对改善行道树生长势衰弱的实验研究

Researches on the Key Technologies of Hollow-Through DTH Used in Gas Drilling

气体钻井用贯通式潜孔锤关键技术研究

A hole or passage made by or as if by use of a drill.

钻孔，打洞用或似用钻打孔或通道

Study on Drilling Tests of PCB Through-Hole Drilling

钻PCB通孔钻切削性能的钻削试验研究

On the quality problems in drilling

浅谈如何防治钻孔灌注桩钻孔施工时质量通病

Hole Clearing by air-lift reverse circulation method in bored piles

冲(钻)孔灌注桩气举反循环清孔工艺

The Better Chosen of the Field Arrangement of the Drill Hole Pulls Out Putting Drills and the Drill Hole Parameter of the Coal Bed Gas in PanJiang Mining Area;

盘江矿区煤层气钻孔抽放钻场布置及钻孔参数优选

The air passage is called the air bleed.

空气通道叫通气孔。

Application of Drilling Engineering in Fracturing Test Borehole of Gasification Coal Mining

钻探工程在气化采煤压裂试验钻孔中的应用

A Brief Explanation of Air Actuated DTH Hammer Drilling Efficiency

空气潜孔锤钻进是提高钻进效率的有效途径

Principle and Application of Air-lift Reverse Circulation in Bored Pile

钻孔灌注桩气举反循环的原理与应用

Research of Technology Problem with Pneumatic Downhole Hammer Core Drilling

气动潜孔锤取心钻进工艺问题的研究

To draw off(a liquid) by piercing a hole in a cask or other container.

钻孔汲取通过在桶或其它容器上钻孔来汲取（液体）

Reason and Precaution of Quality s General Defects in Drilling Perfusion Stake;

钻孔灌注桩质量通病的成因及其预防

The heat contained in a natural steam field is exploited by drilling a suitable number of wells down to the reservoir.

天然蒸气田所含有的热能可以通过钻井的方法，即打适当数量的井孔到达热储的方法进行开采。

tap(ping) drill

螺丝孔钻，螺丝底孔钻

The sorker was drilling.

此工人在用钻孔机钻孔。