| 1. | Check valve applied in descreasing water hammer pressure when the pump stops
止回阀在减小停泵水锤压力中的应用 |
| 2. | Effect of pressure conduit structure movement on water hammer pressure
有压管道结构运动对管内水锤压力的影响研究 |
| 3. | The effect of variation in surge shaft section size upon the reflection of water hammer pressure and the speed of quality fluctuation attenuation
调压井断面尺寸变化对水锤压力反射及质量波动衰减速度的影响 |
| 4. | Ulteriorly , considering the local head loss in inlet opening and pipes junction plays more important role in the calculative results of water hammer pressure calculation of the short pipeline system
考虑进口及多管道连接处的局部水头损失对短管道系统水击压强的计算结果影响较大。 |
| 5. | Through the computation of the water hammer pressure in steel and pvc pipes with the characteristic line method , the influence of velocity of water , material and wall thickness of the pipes to the magnitude , crecent process and phase length of the water hammer pressure is analyzed
应用特征线法，对钢管及pvc管道中水击进行计算，分析了管道中水流流速及管道材料、管壁厚度对管道中水击压强大小、水击压强的增长过程及其相长的影响。 |
| 6. | Abstract : according to the characteristics of solid - liquid two - phase flow , the equation of motion and the equation of continuity for hammer computation are deduced in this paper . the equations are applied to analyze the effect of different prevention deveces used to relieve water hammer pressure in pipeline transport with displacement pumps . it is concluded that the air vessel and pressure relief valve are better than other devices
文摘:本文针对固液两相流的特点，建立了水击计算的运动方程及连续方程，并采用新方程对矿山常采用的容积泵输送中使用的储气罐、泄压阀、缓闭逆止阀等减缓水击压力的防护措施进行了计算分析，得出储气罐、泄压阀减压效果最好的结论。 |
| 7. | The paper uses precise step to produce the continuity function of water hammer mathematic model , not only gains more precise water hammer pressure function and water hammer wave speed function but also founds correct water hammer mathematic model continuity equation movement equation after ignoring subordinate facts , function ( 1 ) and ( 2 ) translate into the current applied water hammer pressure function and water hammer wave speed function
本论文对水击数学模型中的连续性方程重新进行了严谨的推导，不仅得到了更加准确的水击压强和水击波速的计算公式也建立了正确的水击数学模型连续性方程运动方程当忽略次要因素以后，公式( 1 )和( 2 )即可转化为当前应用的水击压强计算公式和水击波速计算公式。 |
| 8. | Secondly , detailedly analyzing reasons inducing these problems , author finds it is that not thinking of the slope of pipeline and the friction in the process of producing water hammer pressure functions , but , thinking of the effect of the slope of pipeline in the process of producing the consequent water hammer calculative continuity function , which results in the inconsequent illogicality in the whole process of producing
接着，对这些问题存在的原因进行了详细分析，发现在当前推导水击压强公式的过程中没有考虑管道的倾斜度和摩擦阻力的影响，而在后面水击计算的连续性方程的推导过程中则考虑了管道的倾斜度，这就导致了在当前连续性方程的整个推导过程中前后矛盾的不合理现象。 |
| 9. | The hemodynamic change induced by embolization of the cerebral arteriovenous malformation was analyzed using the water hammer principle . the highest pressure that can be reached when the water hammer phenomenon occurs was calculated . the acute instantaneous pressure rising may be an important factor leading to intracranial hemorrhage or swelling when the avm is embolized . it is shown that long feeding artery of avm will increase the possibility of direct water hammer , and high wall shear stress of feeding artery will increase the water hammer pressure . this suggests that such kind of avms should be embolized stepwise and the systemic pressure should be rationally reduced before embolization
以水击原理分析了脑avm栓塞治疗时血液动力学变化过程，计算了瞬时水击压力可能达到的最高值。瞬时增高的水击压力可能是avm栓塞时发生急性脑出血或脑肿胀的重要血液动力学因素。而avm供血动脉血管壁面切应力偏高和供血动脉过长可增加水击的危险程度，提示对这类结构avm栓塞治疗时应采取合理的降压措施并尽可能分多次栓塞。 |
| 10. | The other primary part is that based on the correct water hammer mathematic model ( 3 ) , applying character line method , to translate the differential equation group ( 3 ) into character equation group , to count the character equation integral along with character line and at the same time to substitute the integral form for the difference form so as to make use of computer to carry through numerical value calculation of the water hammer pressure
本论文的另一个主要内容是，在正确的水击数学模型( 3 )的基础上，应用特征线法的原理，将微分方程组( 3 )转化成特征方程组，沿特征线对特征方程进行积分，并以其差分方程形式代替积分形式，以便利用计算机进行水击过程的数值计算。论文对各种边界条件也做了相应的推导。 |
