Li Huang

China Shipbuilding Industry Corporation (China)

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Dehao Ju

Marine Design & Research Institute of China

Changzhao Jiang

Brunel University of London

Xiuzhen Ma

Harbin Engineering University

Dai Liu

Tsinghua–Berkeley Shenzhen Institute

Xingcai Lü

Shanghai Jiao Tong University

Zhen Ma

China Academy of Railway Sciences

Yangqian Meng

Marine Design & Research Institute of China

Rui Liu

Nanjing University of Aeronautics and Astronautics

Long Liu

Harbin Engineering University

Xiannan Li

Kansas State University

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Marine Design & Research Institute of China

Harbin Engineering University

Shanghai Jiao Tong University

China Shipbuilding Industry Corporation (China)

University of Birmingham

University of Southampton

Brunel University of London

Loughborough University

Tsinghua–Berkeley Shenzhen Institute

Tsinghua University

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Schlieren and Mie Scattering Visualization of Liquid and Vapor Phase Behavior for Large Nozzle Diameter Injectors Under Marine Diesel Engine Conditions

SSRN Electronic Journal (2022)

Rui Liu Li Huang Mingzhi Feng Dehao Ju Zhen Ma

Due to the critical influence on combustion, a lot of efforts has been put into the understanding of diesel spray evolution. However, for the bigger share of vehicle engines, most of the studies have focused on the injectors with small nozzle diameter and rare studies are focused on the marine diesel engines, which has a larger mass flow rate and longer injection duration. In this paper, the influence of injection pressure, ambient temperature, ambient density and nozzle diameter on spray morphology for medium speed marine diesel engine injectors (with nozzle diameter up to 0.53mm) have been investigated under various non-reacting but evaporative conditions. The experiments were performed via a highly enhanced constant volume chamber with an optical window diameter of 205 mm, and the liquid and vapor penetration were recorded by Mie scattering and schlieren optical configurations respectively. The experimental results show that the vapor spray tip velocity is mainly affected by injection pressure at the start of injection. Among these factors, ambient temperature has a most significant effect on liquid penetration length, but less effect can be found on the spray tip behavior. Given the obvious deviation from heavy duty engines, both for liquid penetration length and vapor spray evolution, the empirical correlations are updated to fit the spray characteristics of medium speed marine diesel engine injectors.

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10.2139/ssrn.4167063

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Modelling and Multi-Objective Combustion Optimization of Marine Engine with Speed Maintaining Control Target

SSRN Electronic Journal (2022)

Jian Zhang Yangqian Meng Dai Liu Long Liu Xiuzhen Ma

In this paper, the modelling and optimized control problem for the marine diesel engine combustion characteristics has been investigated. For marine diesel engine, it is of significant importance to select proper combustion control parameters, by which the target engine speed is maintained stable while economy and emission can be upgraded simultaneously. Firstly, a data-driven model of the marine diesel engine combustion characteristics is established by combining the artificial neural network and Takagi-Sugeno fuzzy modelling methods, with which the overall operating conditions are covered. Then, a double closed-loop control scheme is proposed. The outer loop adjusts the engine speed according to time-varying load requirements, whereas the inner loop aims at optimizing the combustion performance and maintaining the target speed stabilized by the outer loop. Furthermore, the NSGA Ⅲ algorithm with constraints is applied to the data-driven model for multi-objective optimization of combustion performance. The results show that the data-driven model accurately estimate the specification of the engine under various loads. Meanwhile, the proposed double-loop control loop can optimize the combustion while maintaining the navigation stability. Compared with the original machine, a simultaneous reduction of 3.57g/kWh for the brake specific fuel consumption and 9.69% for brake specific NOX emission is achieved, and NOX emission of the optimized marine diesel engine is reduced by 39.2% compared with the Tier Ⅱ legal requirements.

10.2139/ssrn.4305649

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