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THEORY AND EXPERIMENTAL STUDY OF THE SELF-EXCITED OSCILLATION PULSED JET NOZZLE 被引量:29
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作者 LiaoZhenfang LiJun +3 位作者 ChenDeshu DengXiaogang TangChuanlin ZhangFenghua 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第4期379-383,共5页
Comparing with usual continuous jet nozzle, the self-excited oscillationpulsed jet nozzle SEOPJN) can make jet generate a higher peak of pressure and larger scouringvolume. And it can make jet increase the effective s... Comparing with usual continuous jet nozzle, the self-excited oscillationpulsed jet nozzle SEOPJN) can make jet generate a higher peak of pressure and larger scouringvolume. And it can make jet increase the effective standoff distance, too. The basic theories of theSEOPJN are introduced. Some experimental results are shown. According to the results, using tricornbits assembled the SEOPJN to drill oil well, the ROP increases by 8 percent approx 77 percent, andthe rates of the footage for tricorn bit increases by 6.7 percent approx 44.0 percent. 展开更多
关键词 Self-excited oscillation pulsed jet NOZZLE BIT Point vortex
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Effects of hot top pulsed magneto-oscillation on solidification structure of steel ingot 被引量:12
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作者 Hui-cheng Li Yu-xiang Liu +2 位作者 Yun-hu Zhang Zhen Liu Qi-jie Zhai 《China Foundry》 SCIE 2018年第2期110-116,共7页
Achieving a uniform structure with few defects in heavy steel ingot is of high commercial importance. In this present work, in order to verify the potential of pulsed magneto-oscillation(PMO) applied in the production... Achieving a uniform structure with few defects in heavy steel ingot is of high commercial importance. In this present work, in order to verify the potential of pulsed magneto-oscillation(PMO) applied in the production of heavy ingot, an induction coil was located at the hot top of the steel ingot to develop a novel technique, named hot top pulsed magneto oscillation(HPMO). The influences of HPMO on the solidification structure, macro segregation and compactness of a cylindrical medium carbon steel ingot with the weight of 160 kg were systematically investigated by optical microscope(OM) and laser induced breakdown spectroscopy original position metal analyzer(LIBSOPA-100). The results show that HPMO not only causes significant grain refinement and promotes the occurrence of columnar to equiaxed transition(CET) but also can homogenize the carbon distribution and enhance the compactness of the steel ingot. Therefore, HPMO technique has the potential to be applied in the production of heavy steel ingots on an industrial scale. 展开更多
关键词 hot-top pulsed magneto oscillation(HPMO) solidified structures defects of steel ingot
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