Effect of double air injection on performance characteristics of centrifugal compressor

Toshiyuki,; Hirano,; Mizuki,; Takano,; Hoshio,; Tsujita,

doi:10.1007/s11630-017-0903-1

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…In previous studies, 21,22,[32][33][34] when calculating the compressor efficiency, the increase in the mass flow rate and energy caused by the gas injection was ignored. This is because the compressor efficiency was not the focus of these studies, and the injection mass flow rate was low.…”

Section: Principle Of the Compressor With Induced Structure And The A...mentioning

confidence: 99%

“…Hirano et al 21,22 injected high-pressure air from the compressor outlet into the impeller inlet of a compressor using two injection nozzles, demonstrating that the injection air ratio increased with a decrease in the compressor inlet mass flow rate under experimental conditions. The injection air ratio reached up to 12% at the surge inception point and was less than 2% near the choking point.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the design parameters of induced structures on the sensitivity of compressor efficiency and static pressure of induced structure inlets

Zhu

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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A gas-entraining diffuser exhaust gas recirculation (EGR) was proposed to induce the entry of the exhaust gas into the diffuser, to completely utilize the lower static pressure at the diffuser for reducing engine fuel consumption owing to the low engine backpressure. Thus, the induced structure was designed such that a large amount of exhaust gas enters the compressor diffuser. To improve the compressor efficiency and reduce the static pressure at the induced structure inlet, the design parameters of the induced structure (induced angle, induced effective inlet area, parallel part width, and position of the induced structure inlet) were investigated using numerical methods. The results show that the peak compressor efficiency reduced by 4% compared with the compressor prototype, and up to 90% of the compressor efficiency reduction is attributed to the induced gas entering the diffuser, except for the 10% induced gas ratio scenario over the near-choking point. This is because the entropy generation of the induced structure is close to 10% of the entropy generation increase in the diffuser system due to the induced gas at a medium flow rate. Second, in most cases, the compressor efficiency and static pressure of the induced structure inlet increase or decrease simultaneously as the design parameters vary. To select the best induced structure, it is necessary to compromise between the compressor efficiency and static pressure of the induced structure inlet. In fact, the compressor efficiency changes by less than 1% by varying the design parameters of the induced structure, compared with case ID1. This demonstrates that the design parameters have little effect on the compressor efficiency. Compared with the compressor efficiency, the static pressure of the induced structure inlet is more sensitive to the design parameters, particularly the induced effective inlet area and the position of the induced structure inlet.

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Section: Principle Of the Compressor With Induced Structure And The A...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the design parameters of induced structures on the sensitivity of compressor efficiency and static pressure of induced structure inlets

Zhu

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

“…Kim et al suggested a scroll expander and scroll compressor for a 10‐kW class Ericsson engine utilizing solar energy as heat source, and it can yield 10.87 kW for the engine output. Hirano et al adopted two injection nozzles to suppress the surge phenomenon in a centrifugal compressor and found that there is an effective circumferential position to reduce the flow rate occurring surge phenomenon. Wang et al investigated the effects of vapor quality and oil concentration on the performance of a swash plate compressor for automotive air conditioning systems experimentally, and they found that refrigerant/oil mixture never reached steady state.…”

Section: Introductionmentioning

confidence: 99%

The energy performance of a single‐screw compressor for natural gas liquefaction process: Effects of the lubricating oil flow rate

et al. 2019

Int J Energy Res

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Summary An experimental test system including the oil circulation system and the gas circuit system has been designed and built to explore the effects of the lubricating oil flow rate on the performance of a single‐screw compressor, used in a portable natural gas liquefaction process. Outlet pressure, outlet volumetric flow rate, volumetric efficiency, and specific power rate are the parameters for evaluation of the energy performance of the single‐screw compressor. The experimental results indicate that the outlet pressure and outlet volumetric flow rate can be effectively increased by increasing the flow rate of the lubricating oil at different rotational frequencies and that a certain amount of lubricant oil is helpful to improve the volumetric efficiency. In terms of the specific power rate, the optimum oil‐gas ratios are 0.7%, 0.93%, and 1.79%, and the corresponding outlet pressures are 0.45, 0.45, and 0.48 MPa at the conditions of 50, 40, and 30 Hz, respectively.

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