Verfication Results of Cryogenic Inducer Test Facility in JAXA

Yoshida, Yoshiki; Watanabe, Mitsuo; Hashimoto, Kazuhito; Shimagaki, Mitsuru; Yamada, Hitoshi; Sügimura, Takashi

doi:10.1299/jsmefed.2004.33

“…Experiments in liquid nitrogen were conducted at the Cryogenic Inducer Test Facility (CITF) at Kakuda Space Center (KSC) of the Japan Aerospace Exploration Agency (JAXA) shown in Figure 2 [8]. The temperature of the liquid nitrogen was 79 K. The rotational speed was set at 10000 rpm with a flow rate of Q/Q d = 1.00.…”

Section: Experimental Facilities and Proceduresmentioning

confidence: 99%

Influence of Thermodynamic Effect on Blade Load in a Cavitating Inducer

Kikuta

¹

,

Shimiya

²

,

Hashimoto

³

et al. 2010

International Journal of Rotating Machinery

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Distribution of the blade load is one of the design parameters for a cavitating inducer. For experimental investigation of the thermodynamic effect on the blade load, we conducted experiments in both cold water and liquid nitrogen. The thermodynamic effect on cavitation notably appears in this cryogenic fluid although it can be disregarded in cold water. In these experiments, the pressure rise along the blade tip was measured. In water, the pressure increased almost linearly from the leading edge to the trailing edge at higher cavitation number. After that, with a decrease of cavitation number, pressure rise occurred only near the trailing edge. On the other hand, in liquid nitrogen, the pressure distribution was similar to that in water at a higher cavitation number, even if the cavitation number as a cavitation parameter decreased. Because the cavitation growth is suppressed by the thermodynamic effect, the distribution of the blade load does not change even at lower cavitation number. By contrast, the pressure distribution in liquid nitrogen has the same tendency as that in water if the cavity length at the blade tip is taken as a cavitation indication. From these results, it was found that the shift of the blade load to the trailing edge depended on the increase of cavity length, and that the distribution of blade load was indicated only by the cavity length independent of the thermodynamic effect.

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“…Experiments in liquid nitrogen were conducted at the Cryogenic Inducer Test Facility (CITF) at Kakuda Space Center (KSC) of the Japan Aerospace Exploration Agency (JAXA) shown in Figure 2 [8]. The temperature of the liquid nitrogen was 79 K. The rotational speed was set at 10000 rpm with a flow rate of Q/Q d = 1.00.…”

Section: Experimental Facilities and Proceduresmentioning

confidence: 99%

1114 Influence of Thermodynamic effect on Blade Load in a Cavitating Inducer

Kikuta¹,

Hashimoto²,

Shimagaki³

et al. 2009

The Proceedings of the Fluids Engineering Conference

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Distribution of the blade load is one of the design parameters for a cavitating inducer. For experimental investigation of the thermodynamic effect on the blade load, we conducted experiments in both cold water and liquid nitrogen. The thermodynamic effect on cavitation notably appears in this cryogenic fluid although it can be disregarded in cold water. In these experiments, the pressure rise along the blade tip was measured. In water, the pressure increased almost linearly from the leading edge to the trailing edge at higher cavitation number. After that, with a decrease of cavitation number, pressure rise occurred only near the trailing edge. On the other hand, in liquid nitrogen, the pressure distribution was similar to that in water at a higher cavitation number, even if the cavitation number as a cavitation parameter decreased. Because the cavitation growth is suppressed by the thermodynamic effect, the distribution of the blade load does not change even at lower cavitation number. By contrast, the pressure distribution in liquid nitrogen has the same tendency as that in water if the cavity length at the blade tip is taken as a cavitation indication. From these results, it was found that the shift of the blade load to the trailing edge depended on the increase of cavity length, and that the distribution of blade load was indicated only by the cavity length independent of the thermodynamic effect.

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Influence of Thermodynamic Effect on Synchronous Rotating Cavitation

Yoshida

¹

,

Sasao

²

,

Okita

³

et al. 2007

Journal of Fluids Engineering

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Synchronous rotating cavitation is known as one type of cavitation instability, which causes synchronous shaft vibration or head loss. On the other hand, cavitation in cryogenic fluids has a thermodynamic effect on cavitating inducers because of thermal imbalance around the cavity. It improves cavitation performances due to delay of cavity growth. However, relationships between the thermodynamic effect and cavitation instabilities are still unknown. To investigate the influence of the thermodynamic effect on synchronous rotating cavitation, we conducted experiments in which liquid nitrogen was set at different temperatures (74K, 78K, and 83K). We clarified the thermodynamic effect on synchronous rotating cavitation in terms of cavity length, fluid force, and liquid temperature. Synchronous rotating cavitation occurs at the critical cavity length of Lc∕h≅0.8, and the onset cavitation number shifts to a lower level due to the lag of cavity growth by the thermodynamic effect, which appears significantly with rising liquid temperature. Furthermore, we confirmed that the fluid force acting on the inducer notably increases under conditions of synchronous rotating cavitation.

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Verfication Results of Cryogenic Inducer Test Facility in JAXA

Cited by 3 publications

References 0 publications

Influence of Thermodynamic Effect on Blade Load in a Cavitating Inducer

Influence of Thermodynamic Effect on Blade Load in a Cavitating Inducer

1114 Influence of Thermodynamic effect on Blade Load in a Cavitating Inducer

Influence of Thermodynamic Effect on Synchronous Rotating Cavitation

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