Development and Experiments of Cavitation Tunnel for the Liquid with Very Low Temperature

极低温液体空化隧道的研制与实验

• 批准号: 07555307
• 负责人: KATO Hiroharu
• 金额: $ 11.07万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555307/
• 关键词: cavitation; experimant; facility; liquid nitrogen; thermodynamic effect; blow-down; measurement; temperature; Zファクター; 非定常; 極低温液体; 臨界点

A new blow-down type cavitation tunnel was designed and constructed in the first year, 1995 where the liquid nitrogen was used to investigate the thermodynamic effect on cavitation. In 1995 and 1996, cavitation in Venturi was investigated and observed the temperature drop of a few degrees which agreed with the prediction by Z-factor method. In 1996 a rectangular test section was constructed to test the cavitation on a two-dimensional convex shape.The cavitation number at the test section was changed by inserting meshes downstream to produce an intentional pressure drop in the test loop.The main purpose of the present research is to ihvestigate the possibility and the feasibility of such the blow-down type tunnel, which is much handy and cheaper than the normal type tunnnel.During the research the feasibility of the tunnel was verified. The problems to be improved were also pointed out.The test loop including the test section should be filled with the test liquid before the test run, so that the test section is insured in thermal equilibrium condition.Other problems to be solved were accurate calibration methods of thermometers and pressure gauges, and mal-eunction of the flow meter at very low temperature. The thermal stress and shrinkage of the test loop were other important problem.

第一年，即 1995 年，设计并建造了一个新的吹扫型空化隧道，其中使用液氮来研究空化的热力学效应。 1995年和1996年，对文丘里管内的空化进行了研究，观察到温度下降了几度，这与Z因子法的预测一致。 1996年，建造了一个矩形测试段，以测试二维凸形上的空化。通过在下游插入网格来改变测试段的空化数量，以在测试回路中产生有意的压降。本研究的主要目的是研究这种吹气式隧道的可能性和可行性，它比普通型隧道更方便且更便宜。 验证了隧道的可行性。还指出了需要改进的问题。包括测试段在内的测试回路在试运行前应充满测试液体，以保证测试段处于热平衡状态。其他需要解决的问题还有温度计、压力表的准确校准方法以及流量计在极低温度下的误动作。测试环的热应力和收缩是另一个重要问题。

项目成果

H.Kato, T.Kondo, H.Yamaguch, et al.: "Cavitation of Liquid Nitrogen Using a Blow-Down Type Tunnel" ASME Fluids Engineering Division Summer Meeting FEDSM 97. FEDSM97-3259. 1-6 (1997)

H.Kato、T.Kondo、H.Yamaguch 等人：“使用排污型隧道的液氮空化”ASME 流体工程部门夏季会议 FEDSM 97。FEDSM97-3259。

H.Kato, T.Kondo, H.Yamaguchi, M.Maeda: "Cavitation of Liquid Nitrogen Using a Blow-Down type Tunnel" Fluids Engineering Division Summer Meeting FEDSM97, ASME. FEDSM97-3259. 1-6 (1997)

H.Kato、T.Kondo、H.Yamaguchi、M.Maeda：“使用排污型隧道的液氮空化”流体工程部门夏季会议 FEDSM97、ASME。

H.Kato,T.Kondo,H.Yamaguchi: "Cavitation of Liquid Nitrogen Using a Blow-down Type Tunnel" Cavitation and Multi-phase Flow Forum,ASME. (1997)

H.Kato，T.Kondo，H.Yamaguchi：“使用排污型隧道的液氮空化”空化和多相流论坛，ASME。

H.Kato, T.Kondo, H.Yamaguchi, et al.: "Cavitation of Liquid Nitrogen Using a Blow-Down Type Tunnel" ASME Fluids Engineering DivisionSummer Meeting FEDSM 97. FEDSM97-3259. 1-6 (19997)

H.Kato、T.Kondo、H.Yamaguchi 等人：“使用排污型隧道的液氮空化”ASME 流体工程部夏季会议 FEDSM 97。FEDSM97-3259。

近藤 隆、加藤洋治、山口 一: "極低温液体用キャビテーション実験装置の開発" 第37回ターボ機械協会金沢講演会. 94-99 (1996)

Takashi Kondo、Yoji Kato、Hajime Yamaguchi：“低温液体空化实验设备的开发”第 37 届涡轮机械协会金泽讲座 94-99（1996 年）。