In recent years, investigations show that the hazardous noise will be greatly reduced by replacing the large exhaust nozzle with a number of small nozzles, and quantitative relations were found.
在近几年的研究工作中，我们发现用多数小喷口代替排气的大喷口可使其所产生的噪声中对人干扰的部分大大减少，并求得定量关系。
A number of self-excited resonant pulse jet nozzles for deep hole bits were designed on the basis of theoretical analysis and experimental results.
在理论和实验研究的基础上，设计了几种用于牙轮钻头的自激振荡脉冲喷嘴，在常压下进行了射流脉冲压力测试和冲蚀天然红砂岩的实验。
The experimental and analytical results show that the capability of scavenging the bottom-hole increases continuously as the ratio between diameters of nozzles and their number decrease.
实验和分析结果表明，随着喷咀直径比值的减小和喷咀数量的减少，井底净化能力不断提高。
This method is used to design a series of nozzles. Their Mach number profiles are satisfied for the users.
利用该法设计的一系列喷管，其M数分布满足用户需要。
This method is used to design a series of nozzles. Their Mach number profiles are satisfied for the users.
利用该法设计的一系列喷管，其M数分布满足用户需要。
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