查询词典 jet engine

Based on the study on the mechanism of mechanical tool cutting rock with water jet assisted, the optimal jet position relating to pdc bit is attained.

本文正是从这一思路出发，对水射流辅助PDC刀具切割破碎硬及特硬岩石进行了理论和实验研究。

The high-pressure jet is applied widely to the fragmentation of the rock in drilling engineering, but the mechanism of rock fragmentation with jet is not very clear by now.

高压射流辅助破岩在油气井钻井工程中得到广泛应用，其破岩机理还很不明了。

In the process of impact of abrasive jet on rock, resulting dynamic stress plays an important role in rock destruction. The stress wave resulted makes local rock tensile and shearing, then makes rock destructed. In the conditions of some hypotheses, the mechanical model that rock is applied by stress wave, i.e. jet wave basic equations, are set up by wave theory, and the formula of the maximum normal stress resulted by stress wave is deduced according to known boundary conditions.

描述了岩石材料在磨料射流的冲击下破坏的主要原因，分析了应力波就是岩石局部受到拉伸和剪切并最终使岩石发生破坏的根本因素，在这一假设的前提下采用波动理论建立了岩石受应力波作用的力学模型即射流波动的基本方程，在已知的边界条件下推导出了由波动引起的最大正应力的计算公式。

On the base of above models and theories, three new kinds of bits, i.e. extended nozzle roller bit, self\|resonating water jet bit and combined jet and mechanical rock\|cutting bit, are developed.

当时 ，部分学者片面认为水射流的压力越高越好，日本研究出 170 0MPa的增压器，前苏联和美国研究出 56 0 0MPa的脉冲射流发生器。

The advantage of the swirling water jet breaking rock is the heavy breaking efficiency, large breaking area and less energy used to break rock per unite volume, so the swirling water jet can drill in a hole of a large diameter.

旋转射流破岩的优势在于破碎面积大、效率高、破岩比能低，因而旋转水射流能够钻出大直径的岩石孔眼。

The shockwave of the meteorite strike on the terrane of the surface passes the dynamic energy to the surface and forms the target terrane shatter cone; due to the fact that the terrane of stricken surface can not maintain the state of stress, a cluster of rarefaction wave was formed behind the shockwave to decompress terrane substances from high pressure state, this cluster of rarefaction wave ejects with high speed from the interface between the substances such as meteorite, surface terrane and lava, the shockwave compresses the target terrane substances, generating super-high temperature and forming a jet current of rock mass, rock powder, lava or rock fog with high pressure and temperature, the jet current lasted until the shockwave rebounded from the backside of rock, and the target of meteorite-stricken surface is formed on surface.

陨石撞击地面岩层时的冲击波把动能传给地表产生靶岩震裂锥，由于被撞击地表岩层不能维持应力状态，冲击波后面就发展一簇稀疏波使岩层物质从高压状态下减压，在陨石、地表岩层、熔岩等物质交界处高速喷出，冲击波压缩靶点岩层物质产生超高温，成为压力大温度高的岩块、岩粉、熔岩或岩雾喷射流，直到冲击波从岩石背侧反射、地面上形成陨击靶点。

A jet-propelled vehicle, especially a jet-propelled aircraft.

喷射器喷气式机动装置，尤指喷气式飞机

A daredevil wearing a jet pack flew across a 1,500-foot-wide canyon in Colorado in November. A Swiss pilot, dubbed "Fusion Man," flew across the English Channel last year using a single jet-propelled wing.

去年11月份，身着个人飞行器的一位冒险者穿越了位于科罗拉多州的一个宽1500英尺的大峡谷；去年，称为&聚变人&的一位瑞士飞行员用喷气引擎整体机翼飞过了英吉利海峡。

Switzerland —Neither a bird nor a plane,"Jet Man"—aka adventurer Yves Rossy—soars above the Alps on jet-propelled wings during a five-minute, 186-mile-an-hour flight.

瑞士—-那不是一个鸟，，也不是飞机，&喷气人&，有名冒险家伊夫 Rossy ，飞机在阿尔卑斯山上方腾飞推进5分钟，时速每一小时186英里的飞行翼。

Thus ensuring axial symmetry of the nozzle and jet pipe in the structure design is the key of preventing the jet pipe from being pressed and locked.

保证喷嘴、喷管结构的轴对称性是防止喷管后段成为受压缩状态、乃至导致摩擦锁止的关键。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

We need you to cosign our public letter demanding that press intimidation cease immediately, and that all charges be dropped.

我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。