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dc.contributor.author許哲綱en_US
dc.contributor.authorChe-Kang Hsuen_US
dc.contributor.author吳宗信en_US
dc.contributor.authorJong-Shinn Wuen_US
dc.date.accessioned2014-12-12T02:31:23Z-
dc.date.available2014-12-12T02:31:23Z-
dc.date.issued2002en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#NT910489104en_US
dc.identifier.urihttp://hdl.handle.net/11536/70862-
dc.description.abstract利用三維非結構直接蒙地卡羅法模擬稀薄氣體於螺旋曳引式幫浦的流場,並且在模擬中使用VHS(Variable Hard Sphere)分子模型、NTC(No Time Counter)碰撞取樣、VTS(Variable Time-Step)及利用Cell-By-Cell 的粒子追蹤法來完成分子的移動。根據1991年 Nanbu 的實驗條件,直接模擬真實三維螺旋曳引式幫浦的幾何參數(包括螺旋溝槽深度、靜子與轉子的間隙、螺旋角)和轉速,利用幫浦性能參數體積流率、質量流率、壓縮比、進出口壓差,進行在幫浦管道中的流場的分析。結果顯示溝槽深度、分子重、螺旋角和轉速的增加可以提高抽氣速率和質量流率;當轉子與靜子間隙加大,抽氣速率和質量流率將會下降。zh_TW
dc.description.abstractNumerical simulations of rarefied gas flows in spiral drag pump (SDP) channel are carried out by using the three-dimensional unstructured direct simulation Monte Carlo (DSMC) method. Using Variable Hard Sphere (VHS) molecular model, No Time Counter (NTC) collision sample and variable time-step method (VTS) to simulate the molecular collision kinetics and use Cell-By-Cell particle tracing method complete the part of molecular move. According to Nanbu et al. (1991) experiment condition, to simulate a real three-dimension model on SDP geometry parameter (include depth of groove, gap size, screw angle) and rotation speed directly, use the pump performance parameter are volumetric flow rate (pumping speed), mass flow rate (throughput), compression ratio, and pressure different (between discharge and inlet) to analysis the flow field in the pump channel. The flow occurring in the pumping channel develops from the molecular transition to slip flow traveling downstream. Results show that to increase the depth of groove, molecules mass, screw angle and rotation speed can raise the pumping speed and the mass flow rate. As the gap value increases, pumping speed and the mass flow rate will be decreased.en_US
dc.language.isozh_TWen_US
dc.subject直接蒙地卡羅法zh_TW
dc.subject螺旋曳引式幫浦zh_TW
dc.subject壓縮比zh_TW
dc.subjectdirect simulation Monte Carloen_US
dc.subjectspiral drag pumpen_US
dc.subjectcompression ratioen_US
dc.title利用直接模擬蒙地卡羅法於螺旋曳引式幫浦參數研究zh_TW
dc.titleParametric Study of Spiral Drag Pump Using The DSMC Methoden_US
dc.typeThesisen_US
dc.contributor.department機械工程學系zh_TW
Appears in Collections:Thesis