Performance of a direct-injection natural gas engine with multiple injection strategies

Li, Menghan; Liu, Gengfei; Liu, Xiaori; Li, Zhijie; Zhang, Qiang; Shen, Boxiong

doi:10.1016/j.energy.2019.116363

Cited by 21 publications

(5 citation statements)

References 21 publications

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“…In the third generation of NGEs, the technology of direct cylinder natural gas injections was applied, which could precisely control the mixture concentration and flow rate [11]. The intake throttle valve in the intake pipe was removed.…”

Section: The Third Generation Of Ngesmentioning

confidence: 99%

A Review of Development of Natural Gas Engines

Liu¹,

Zhang²,

Liu³

2023

IJAMM

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Review A Review of Development of Natural Gas Engines Lidong Liu 1, Mengli Zhang 1, and Zhengbai Liu 2, * 1 College of Automobile and Traffic Engineering, Liaoning University of Technology, Jinzhou 121001, China 2 School of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, China * Correspondence: liuzb3@sustech.edu.cn Received: 4 January 2023 Accepted: 22 February 2023 Published: 9 March 2023 Abstract: Natural gas has been successfully applied to the operation of internal combustion engines (ICEs) in various applications including automotive vehicles and generator sets, and is becoming a promising alternative fuel in ICEs due to its advantages such as the excellent knock resistance, stable combustion process, and low pollutant emissions. The operation cost of vehicles using natural gas engines (NGEs) is remarkably reduced, as the price of natural gas is over 50% lower than that of gasoline or diesel fuel. This review describes three stages of the NGEs development followed by discussions of natural gas resources, mechanisms underlying structural design and combustion process of NGEs, as well as different technologies applied in NGEs. The scientific guidance for research and development of NGEs is also provided in this review.

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Section: The Third Generation Of Ngesmentioning

confidence: 99%

A Review of Development of Natural Gas Engines

Liu¹,

Zhang²,

Liu³

2023

IJAMM

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“…According to equation (10), the theoretical gas mass flow rate is not a constant value but will change with the P 0 , and P 0 has a decreasing tendency during gas injection. Therefore, to ensure the accuracy of the measurement of the transient flow coefficient, this study collected the real-time P 0 by installing a high-response pressure sensor at the injector gas inlet to calculate the real-time theoretical gas mass flow rate, as shown in Figure 5.…”

Section: Measurement Principle Of Gas Transient Discharge Coefficientmentioning

confidence: 99%

“…However, the traditional spark plug ignition premixed natural gas engine has a larger knock tendency, and its compression ratio is much lower than a diesel engine, resulting in low thermal efficiency and output power, which cannot meet the goal of efficient and clean combustion of the natural gas engine. [10][11][12][13] High Pressure Direct Injection (HPDI) technology is the key to developing natural gas as a low-carbon fuel for internal combustion engines. 14 At the later stage of the compression stroke, the dual injector injects an appropriate amount of diesel into the cylinder to form a fire core that ignites the high-pressure natural gas injected into the cylinder afterward.…”

Section: Introductionmentioning

confidence: 99%

“…HPDI combustion mode is the coexistence of premixed and diffusion combustion, with diffusion combustion as the main mode. 10,[15][16][17] Compared with the port fuel injection technology, the direct injection technology has no obvious effect on the air-filling capacity, which allows the engine to reach a higher power limit. The multi-diesel beam igniting natural gas increases the combustion speed and is beneficial to enhancing the dynamic performance and emission.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The United States, being the first country to exploit shale oil and gas and conduct related research, has led the shale oil and gas revolution, achieving large-scale production of shale fields [2][3][4][5]. After that, Canada [6][7][8], South Africa [9,10], Argentina [11,12], and some European countries [13] have begun research on shale gas exploration and development. According to the statistics [14], in 2021, the US produced 5.49 × 10 8 tons of crude oil, of which shale oil contributed 3.62 × 10 8 tons, accounting for 65.9% of total crude oil production.…”

mentioning

confidence: 99%

Shale Fracturability Graphic Template Based on Mixed Analytic Hierar-chy Process and Mutation Theory

Li,

Liu,

Cheng

et al. 2024

ENERGY

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Due to the depletion of conventional energy reserves, there has been a global shift towards non-conventional energy sources. Shale oil and gas have emerged as key alternatives. These resources have dense and heterogeneous reservoirs, which require hydraulic fracturing to extract. This process depends on identifying optimal fracturing layers, also known as 'sweet spots' . However, there is currently no uniform standard for locating these sweet spots. This paper presents a new model for evaluating fracturability that aims to address the current gap in the field. The model utilizes a hierarchical analysis approach and a mutation model, and is distinct in its use of original logging data to generate a fracturability evaluation map. Using this paper's shale fracturing sweet spot evaluation method based on a two-step mutation model, four wells in different blocks of Fuling and Nanchuan Districts in China were validated, and the results showed that the proportion of high-yielding wells on the sweet spot line could reach 97.6%, while the proportion of low-producing wells was only 78.67%. Meanwhile, the evaluation results of the model were compared with the microseismic data, and the matching results were consistent.

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Performance of a direct-injection natural gas engine with multiple injection strategies

Cited by 21 publications

References 21 publications

A Review of Development of Natural Gas Engines

A Review of Development of Natural Gas Engines

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

Shale Fracturability Graphic Template Based on Mixed Analytic Hierar-chy Process and Mutation Theory

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