Measurement and verification of transient injection flow rate of high pressure natural gas pulse injector

Dong, Quan; Yang, Xiyu; Jia, Demin; Song, Enzhe; Yao, Chong

doi:10.1016/j.flowmeasinst.2020.101831

Cited by 14 publications

(3 citation statements)

References 10 publications

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“…26 Dong et al proposed a measurement method of gas injection characteristics. 27 However, this method can accurately obtain the cyclic mass flow, but the transient characteristics are poor, requiring a complex signal modulation process. In addition, natural gas is the main contributor fuel of engine output power, and the injector gas inlet pressure shows a continuous drop during gas injection, as well as the drop value, is not negligible.…”

Section: Introductionmentioning

confidence: 99%

Measurements and analyses on the two-phase fuel transient flow characteristics of dual fuel co-direct injector

Wei,

Ju,

Yang

et al. 2023

International Journal of Engine Research

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In this research, an innovative two-phase fuel transient flow coefficient measurement system is proposed to investigate the flow characteristics and coupling effects of two-phase fuel, and to fill the gap of the two-phase fuel flow characteristics measurement technology of dual fuel injector. For this purpose, microphotography technology is used to obtain the original image of the injector hole, and the accurate area of the injector hole can be obtained by image processing. The two-phase injection momentum and the transient injection pressure are measured by the impact force sensor and the pressure sensor respectively, and the two-phase fuel transient flow coefficient is obtained. Due to the change of the increasing rate of the effective flow area at the nozzle, the gas transient flow coefficient shows two different increasing trends during the upward stage of the gas needle valve. With the background pressure increase, the maximum gas transient flow coefficient decreases and injection duration increases. The influence of pilot diesel injection on subsequent gas injection stages is mainly reflected in that when the gas energizing time is 0.8 ms, the fluctuation range of gas mass flow caused by diesel injection is 52.6%, and the fluctuation range is 14.9% when the gas energizing time is 2 ms, but the influence of diesel injection on the peak value of gas transient flow coefficient can be ignored.

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Section: Introductionmentioning

confidence: 99%

Measurements and analyses on the two-phase fuel transient flow characteristics of dual fuel co-direct injector

Wei,

Ju,

Yang

et al. 2023

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…The transient discharge coefficient can effectively reflect the actual dynamic changes in the nozzle 13–15 and contains rich information of fuel flow and coupling movement. 16,17 However, researchers have found that the transient change process of discharge coefficient is very complex in the injection process.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10] The discharge coefficient of the nozzle is an important parameter of the injector, which will have an important impact on the fuel consumption, smoke level, and external characteristics of the diesel engine. 11,12 The transient discharge coefficient can effectively reflect the actual dynamic changes in the nozzle [13][14][15] and contains rich information of fuel flow and coupling movement. 16,17 However, researchers have found that the transient change process of discharge coefficient is very complex in the injection process.…”

Section: Introductionmentioning

confidence: 99%

Research on innovative one-dimensional mathematical model applied to the on-line measurement for transient discharge coefficient of diesel injector nozzle

Yang

Zhou

Dong

et al. 2021

International Journal of Engine Research

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This paper presents an innovative one-dimensional mathematical model applied to the on-line measurement for transient discharge coefficient of diesel injector nozzle. The state change in the fuel system is abstracted into the transfer and evolution process of the Riemann wave, and a direct mathematical relationship between the pressure and the transient discharge coefficient in a single Riemann wave environment is established. The on-line calibration method of fuel sound velocity is proposed, which avoids the complicated off-line calibration of fuel physical property. The time-domain characteristics recognition method of input signal is put forward and the model is segmented according to time characteristics to improve the applicability. The decoupling algorithm of reflected wave and the correction method of interference wave are proposed to improve the model robustness. The experimental results show that this mathematical model has good accuracy. It is found that the variation of the average discharge coefficient with injection pressure and pulse width is nonlinear due to the cavitation and needle valve average opening.

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Experimental study on the two-phase fuel transient injection characteristics of the high-pressure natural gas and diesel co-direct injection engine

Yang

Wang

Dong

et al. 2022

Energy

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Measurement and verification of transient injection flow rate of high pressure natural gas pulse injector

Cited by 14 publications

References 10 publications

Measurements and analyses on the two-phase fuel transient flow characteristics of dual fuel co-direct injector

Measurements and analyses on the two-phase fuel transient flow characteristics of dual fuel co-direct injector

Research on innovative one-dimensional mathematical model applied to the on-line measurement for transient discharge coefficient of diesel injector nozzle

Experimental study on the two-phase fuel transient injection characteristics of the high-pressure natural gas and diesel co-direct injection engine

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