The author takes consider of the aerial condensability . according to newton ’ s second law and gas equation , it is elicited to the gas pressure distributives in the drill pipe 通过压力分布图可知,截面突变导致压力发生突变,空气流速在该处最低,因此,最小风量采用截面突变处风速计算。
2.
The dr . wu lumbar tractor has modern design with two jars which utilize the condensability of air and the hydromechanical theory to realize the auto balance of the air pressure in the two jars , thus guaranteeing the elastic pulling of lumbar , the only one that conforms to the “ human bio - elastic mechanics ” 伍医生腰椎牵引器设计新颖，采用双气缸连通，利用空气的可压缩性与流体力学的原理实现了两气缸压力自动平衡，达到腰椎弹性牵引之目的，是目前国内唯一符合“人体弹性生物力学”的腰椎牵引器。
3.
Fluid noise mainly comes from out put pulsation of rate of flow , the main reason of out put pulsation of rate of flow is the instant high pressure return flow that obturation cubage produced when the big round curve pressure transition . the v trough on the port plate can reduce the fluid noise . in this paper , the author based on the acting of dam a river and condensability of liquid and used matlab language as tool to calculate the v trough on the original port plate and drew out the p - t diagrammatic curve and analyzed its shortcoming and improved the design of original v trough and got that the best size of its angle was 12 . 3 and its length was 5mm and the cross section was an equilateral triangle 流体噪声主要来源于输出流量脉动，造成输出流量脉动的主要原因是闭死容积在大圆弧段压力切换时产生的瞬时高压回流，在配流盘上开设v型尖槽可降低因高压回流而引起的流体噪声，本文以截流作用和液体的可压缩性为理论依据，以matlab语言为工具，对原配流盘上的v型尖槽进行了理论计算，绘制出p - t图线，分析了它的不足，并对原有v型尖槽进行了优化设计，得出了v型尖槽的最佳几何尺寸：配流盘平面上的v型尖槽的两边的夹角为12 . 3 ，槽长5mm ，槽的横截面为等边三角形。
