Explanipedia

Marine Lifecycle Carbon Footprint Toward Carbon Neutrality: Recent Progress and Prospects Open

Y. L. Chang, Dai Liu, Feixiang Chang, Chang Zhai, Long Liu , et al. · 2025

The problem of global climate change is becoming increasingly serious, drawing worldwide attention to the need for carbon emissions reduction. As a primary mode of transport, maritime shipping accounts for 2% of global carbon emissions. Th…

Improving Biodiesel Atomization Performance in CI Engines: A Review of Spray Behavior, Droplet Impingement, and Advanced Techniques Open

Zehao Feng, Junlong Zhang, Ju Gu, Xianyin Leng, Zhixia He , et al. · 2025

The escalating challenges of greenhouse gas emissions, coupled with the severe depletion of oil reserves and the surging global energy demand, have emerged as critical concerns requiring urgent attention. Against this backdrop, biodiesel h…

Visualization study on characteristics of hydrogen jet injected through gas admission valve in marine engine Open

Shuo Yin, Wenjing Xing, Kentaro Miyuki, Sushil Raut, Kazunori Sato , et al. · 2025

This paper presents an experimental investigation into the morphological behavior of a hydrogen jet via visualization. First, hydrogen is injected into a crossflow field emulating the intake of marine hydrogen engines. Both conventional an…

Experimental and Modeling Study of the Ultra-High Pressure Spray Dynamics in the Near and Far Fields Under High Ambient Density Conditions Open

Chen An, Long Liu, Hongliang Luo, Qian Xiong, Beini Zhou , et al. · 2025

Application and extension of diesel spray theory in analysis of methanol spray characteristics under high-pressure injection conditions Open

Pengbo Dong, Yifan Zhang, Yang Wang, Wuqiang Long, Jiangping Tian , et al. · 2024

Methanol has received widespread attention as a kind of alternative fuel for internal combustion engines because of its wide range of sources, low price, low combustion emission pollution, and carbon neutrality. Meanwhile, the relatively d…

Study on Hydrogen Direct Injection in RNG Combustion under Various Ignition Timings for Power Generation in a Retrofitted Gas Engine Open

Meiqi Yu, Hongliang Luo, Beini Zhou, Yang Liu, Chang Zhai , et al. · 2024

Renewable natural gas (RNG) is attractive for energy policy goals in the world. Therefore, a regional system is designed to explore RNG combustion for power generation in localities. This study investigates a direct injection (DI) engine f…

Effect of vortex fluctuation in a 90-degree curved pipe on the surface fluctuation of an ejected liquid jet Open

Erwei Liu, Mikimasa KAWAGUCHI, Ryoutaro NAKAYAMA, Masato IWASAKI, Keiya Nishida , et al. · 2024

Improving the thermal efficiency of internal combustion engines requires a high compression ratio, a high thermal load, and high mechanical strength in the combustion chambers. However, they will promote excessive temperatures within the c…

Experimental Study on Diesel Spray Flame and Wall Heat Transfer of Two-Dimensional Combustion Chambereffect of Common Rail Pressure Open

Herry Sufyan Hadi, Herry Sufyan Hadi, Chengyuan Fan, Atsushi Takayama, Keiya Nishida , et al. · 2024

Experimental and Modeling Study of the Ultra-High Pressure Spray Dynamics in the Near and Far Fields Under High Ambient Density Conditions Open

Chen An, Hongliang Luo, Keiya Nishida · 2024

Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition Open

Run Chen, Keiya Nishida, Xinyi Zhou, Tie Li · 2023

The direct injection of ethanol-gasoline blended fuel into the engine cylinder near the top dead center (TDC) is evitable to suffer from the wall impingement due to more injection mass required to maintain the same air/fuel ratio with trad…

An Examination of Heat Transfer Dynamics in Pulsating Air Flow within Pipes: Implications for Automotive Exhaust Engines Open

Yuki Kato, Guanming Guo, Masaya Kamigaki, Kenmei Fujimoto, Mikimasa KAWAGUCHI , et al. · 2023

The detailed understanding of heat transfer in the pulsating airflow in the pipe is critical to reducing heat losses in the engine exhaust stream and improving catalyst performance. In the present investigation, we have scrutinized the imp…

Characteristics of Droplet Behaviors during Spray Breakup Process Open

Feixiang Chang, Hongliang Luo, Panpan Dong, Keiya Nishida, Yoichi Ogata , et al. · 2023

The variation of droplet parameters during the spray breakup process affects the droplet deposition behavior and accurate application. The aim of this study was to experimentally investigate droplet behaviors along the penetration directio…

Evaluation of Vaporizing Diesel Spray with High-Speed Laser Absorption Scattering Technique for Measuring Vapor and Liquid Phase Concentration Distributions Open

Samir Chandra Ray, Safiullah Safiullah, Shinichiro Naito, Mats R. Andersson, Keiya Nishida , et al. · 2023

The Conventional Laser Absorption Scattering (C-LAS) technique is used to measure the mixture concentration and visualize the vapor phase. The former is determined by the attenuation of visible and ultraviolet light whereas the latter is a…

Investigating the effects of split injection with different injection patterns on diesel spray mixing Open

Intarat Naruemon, Long Liu, Qihao Mei, Yue Wu, Xiuzhen Ma , et al. · 2023

In recent studies, it has been established that improvements in the injection rate results in improved mixing, combustion efficiency, and reduced pollutant emissions. Varying injection rates have been observed to find out the optimization …

Single and twin string cavitation swirling flows in multi-hole mini-sac diesel injector and sprays Open

Samsu Dlukha Nurcholik, Akira Sou, Takashi Miwa, Mikimasa KAWAGUCHI, Yuhei Matsumoto , et al. · 2023

A new design of fuel injector for diesel engines is expected to enhance fuel spray atomization at the end of the fuel injection for the reduction in particulate matter emission. It was pointed out that string cavitation may occur in a mult…

Study on fermentation gas combustion with hydrogen addition under various throttle openings Open

Hongliang Luo, Meiqi Yu, Chang Zhai, Yanzhao An, Chao Wang , et al. · 2022

Regional energy systems are designed to contribute to a green and “carbon neutral” economy of localities. In this system, the engine combustion is significant for power generation. Therefore, this study mainly investigated the effect of th…

Combustion Performance of Hydrogen Direct Injection under Lean-burn Conditions for Power Generation Open

Meiqi Yu, Hongliang Luo, Chang Zhai, Yanzhao An, Keiya Nishida · 2022

This paper studies the combustion phenomenon of hydrogen (H2) direct injection (DI) in a modified spark ignition (SI) engine. As we known, ignition timing strongly correlates with combustion performance, especially for power output and eff…

Correlation Between Wall Heat Transfer And Characteristics Of Pulsating Flow In A Rectangular Tube Toward An Automobile Exhaust System Open

Yuki Kato, Guanming Guo, Masaya Kamigaki, Kenmei Fujimoto, Mikimasa KAWAGUCHI , et al. · 2022

The objective of this study is to investigate experimentally the effect of pulsation frequency on the heat transfer characteristics and the mechanism of the pulsation flow, which is representative of the operating conditions of the engine …

Effect of Single and Split Injection on Combustion Process of Diesel Spray Injected into 2d Piston Cavity Open

Kang Yang, Zhixia He, Yanzhi Zhang, Keiya Nishida · 2022

Effect of internal unsteady flow of 90 degree bend nozzle with circular cross-section on oil jet behavior Open

Mikimasa KAWAGUCHI, Ryoutaro NAKAYAMA, Masato IWASAKI, Keiya Nishida, Jun Nishikawa , et al. · 2022

Methods of decreasing the CO2 emissions of the internal combustion engine have been suggested. However, these methods generate high combustion temperatures that increase the heat load in general. Therefore, the piston cooling gallery has b…

Analysis for internal unsteady flow of 90 degree bend nozzle with circular cross-section using mode decomposition method Open

Ryotaro NAKAYAMA, Mikimasa KAWAGUCHI, Masato IWASAKI, Keiya Nishida, Yoichi Ogata , et al. · 2022

Typical thermal efficiency improvement methods for automotive engines tend to result in higher combustion temperatures. Therefore, it is important to elucidate the characteristics of oil jet behavior in order to develop highly efficient pi…

Study of Wall Heat Transfer of Pulsating Airflow in Rectangular Pipe Assuming Flow Field of Automobile Engine Exhaust System Open

K. Fujimoto, Yuki Kato, Mikimasa KAWAGUCHI, Keiya Nishida, Jun Nishikawa , et al. · 2022

The airflow in the exhaust pipe of an automobile engine fluctuates periodically in terms of flow velocity and gas temperature, and understanding the complex flow and heat transfer characteristics is extremely important for improving the pe…

Development of High-Speed Laser Absorption Scattering (HS-LAS) System for Measuring Vapor and Liquid Phase Concentration Distributions in Evaporating Diesel Spray Open

Samir Chandra Ray, Shinichiro Naito, Safiullah Safiullah, Mats R. Andersson, Keiya Nishida , et al. · 2022

The fundamental concept of the LAS technique is to understand the fuel concentration by attenuation of both visible and ultraviolet light. The intensity of visible light is only attenuated by the scattering of droplets, while that of ultra…

Effect of bend of horizontal rectangular duct on Scattering and Breakup of gas-liquid interface Open

Tomoki MARUOKA, Mikimasa KAWAGUCHI, Keiya Nishida, Yoichi Ogata, Yoshie NAGANO , et al. · 2022

The flow of a liquid film sheared by gas stream in a horizontal rectangular bent duct was investigated using a high-speed camera. Compared to the straight horizontal duct condition, the local gas-phase velocity distribution in the bend and…

Effect of Oxygen Concentration on the Split Injection Combustion Process of Diesel Spray Injected into 2d Piston Cavity Open

Kang Yang, Genmiao Guo, Zhixia He, Yu Jin, Keiya Nishida · 2022

RIM Experiment on Fuel Adhesion Characteristics of Inclined-Wall-Impinging Spray under Cross-Flow Conditions Open

Gengxin Zhang, Penghua SHI, Hongliang Luo, Yoichi Ogata, Keiya Nishida · 2022

The impingement of fuel sprays on the piston surface significantly affects mixture formation, combustion performance, and pollutant emissions in Direct-Injection Spark-Ignition (DISI) engines. To better understand the fuel adhesion behavio…

Effect of Oxygen Concentration on the Split Injection Combustion Process of Diesel Spray Injected into 2d Piston Cavity Open

Kang Yang, Genmiao Guo, Zhixia He, Yu Jin, Yuhang SHEN , et al. · 2022

Evaporating characteristics of diesel sprays under split-injection condition with a negative dwell time Open

Yu Jin, Qing Wu, Chang Zhai, Jaeheun Kim, Hongliang Luo , et al. · 2021

This paper investigates the effects of the split-injection strategy with a negative dwell time using a multi-hole diesel injector under evaporating conditions. To compare with negative dwell conditions, the single-injection and positive an…

Reaction Rate of Hydrothermal Ammonia Production from Chicken Manure Open

Yukihiko Matsumura, Yuito Suganuma, Takayuki Ichikawa, Wookyung Kim, Yutaka Nakashimada , et al. · 2021

Ammonia is an important fertilizer feedstock and an expected next-generation hydrogen carrier. Thus, it is necessary to ensure effective production of ammonia from the waste biomass. In this regard, chicken manure was treated in an autocla…

Characterization of Liquid and Air Flow Behaviours in Twin Fluid Atomizer for Gas Turbine Combustor Open

Wenjing Xing, Keiya Nishida, Yoichi Ogata, Kazunori Sato, Kazuaki Hashiguchi · 2021

A twin-fluid atomizer for gas turbine combustors was examined in the present study.The experimental and numerical methods were applied to analyse air-liquid collision and interacting behaviours in the atomizer.High-speed photography was us…

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