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RISS 인기검색어
- 검색키워드
- 저자 : Satoru Ohashi (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Numerical Investigation of Suction Performance of Inducer with Splitter Blade
Yohei Tanaka,Satoshi Watanabe,Satoru Ohashi,Yasushi Matsunaga 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.4
For general-use turbopump inducers, high suction performance is required in a wide operating range including the cutoff point. At the low flow rates, low frequency cavitation surge is known to occur with the strong inlet backflow from the inducer. The reduced inlet blade angle would be favoured for the suppression of this inlet backflow, whereas the reduced inlet blade angle causes the deterioration of suction performance through the reduced inlet throat area. In this study, a splitter blade was adopted for the helical inducer to overcome or relieve these two conflicting problems, and the effectiveness was investigated by CFD considering cavitation. First, the favourable length and the circumferential position of short blade were investigated by 2-D cascade model. Then, the obtained suitable cascade design was applied for the 3-D helical inducer. As a result, the inlet backflow was found to be weakened at the low flow rates as expected, while keeping the good suction performance of inducer in the whole flow rate range.
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Evaluation of Suction Performance of Inducer with Splitter Blade
Yohei Tanaka,Takahiro Kitabata,Satoshi Watanabe,Satoru Ohashi,Akira Sakata,Yasushi Matsunaga 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.1
For general-use turbopumps with inducer, instability-free operation is required as well as high suction performance in a wide operating range from shut-off to over flow rates. Among the instabilities, the cavitation surge at low flow rates is a very vital phenomenon that is known to be strongly associated with the occurrence of inlet back flow. The low inlet blade angle would be favorable for the suppression of inlet backflow through the reduction of blade loading at the inlet, while the inlet throat area should be kept large for better suction performance to minimize the flow blockage due to cavitation. In the present study, a splitter blade inducer is designed on the basis of the knowledge acquired by our previous CFD study conducted for the 2-D cascade and 3-D straight-hub inducer. Then the effectiveness of the splitter inducer is investigated by experiments and CFD. As a result, the inlet backflow and the cavitation surge are found to be suppressed in the splitter inducer, which is achieved by reducing the blade loading with low inlet blade angle. The suction performance is improved at high flow rates by relaxing the low pressure region with high relative velocity.
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Suction Performance and Cavitation Instabilities of Turbopumps with Three Different Inducer Design
Tatsuya Morii,Yohei Tanaka,Satoshi Watanabe,Satoru Ohashi,Yasushi Matsunaga 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.2
In the present study, the suction performance and the cavitation instabilities in turbo-pumps with three different inducers designed with different design incidence angle are experimentally investigated in the wide range of operating flow rate. Three inducers L with the lowest design incidence angle, M with the moderate one and H with the largest one are used in combination with identical main impeller. As a result, the total head of pump with inducer H is confirmed to be the largest especially at large flow rates, while the shaft power is almost the same, resulting in the best efficiency with the inducer H. The suction performance is the best with inducer H at large flow rates and is the best with inducer L at low flow rates. Two kinds of instabilities, the cavitating whirling vortex and the surges are mainly observed for the all both inducers, but they are limited at low flow rates. The occurrence ranges of these instabilities in terms of the operating flow rate is the widest with inducer H. However, those in terms of the shockless flow rate ratio is similar for the all three inducers: This fact can contribute to establish some guideline to the pump operation avoiding serious flow instabilities.
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