A5007096820- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Vehicle emissions and performance
- Engineering Applied Research
- Fluid Dynamics and Heat Transfer
- Combustion and Detonation Processes
- Aerodynamics and Acoustics in Jet Flows
- Electrohydrodynamics and Fluid Dynamics
- Catalytic Processes in Materials Science
- Computational Fluid Dynamics and Aerodynamics
- Plant Surface Properties and Treatments
- Electric Vehicles and Infrastructure
- Fluid Dynamics and Turbulent Flows
- Acoustic Wave Phenomena Research
- Biodiesel Production and Applications
- Energy, Environment, and Transportation Policies
- Thermochemical Biomass Conversion Processes
- Electric and Hybrid Vehicle Technologies
- Heat transfer and supercritical fluids
- Fluid Dynamics and Mixing
- Rocket and propulsion systems research
- Plasma and Flow Control in Aerodynamics
- Real-time simulation and control systems
- Hydraulic and Pneumatic Systems
- Wind and Air Flow Studies
The University of Tokyo
1983-2025
Fuji Heavy Industries Health Insurance Society Ota Memorial Hospital
2023
Gunma University
2009-2020
Kiryu University
1987-2019
Honda (Japan)
2000
National Institute of Health
1997
Massachusetts Institute of Technology
1990
Decarbonizing road freight transport is difficult due to its reliance on fossil fuel internal combustion engine vehicles (ICEVs). The role of powertrain electrification in achieving deep decarbonization was studied using a vehicle stock turnover model, focusing Japan. Twelve types were considered; combining four powertrains, ICEV, hybrid electric (HEV), battery (BEV) and cell (FCEV); three size classes, normal, compact mini-sized vehicles. A scenario-based approach used; considering Base...
We developed a single-molecule enzyme activity assay platform for NAD(P)+-dependent oxidoreductases, leveraging new NAD(P)H-responsive fluorogenic probe optimized microdevice-based fluorometric detection. This enabled the detection of activities in blood and cerebrospinal fluid (CSF), including lactate dehydrogenase, glucose-6-phosphate hexokinases. demonstrate its potential activity-based diagnosis by detecting altered populations species CSF from liver damage brain tumor patients.
The effect of fuel injection timing relative to ignition on natural gas direct-injection combustion was studied by using a rapid compression machine (RCM). fixed at 80 ms after the start. When relatively early (injection start 60 ms), heat release pattern showed slower burn in initial stage and faster late stage, which is similar that flame propagation premixed gas. In contrast this, when 75 rate diesel combustion. shortest duration realized end (the same as timing) over wide range...
Road freight transport is dominated by gasoline- and diesel- fueled internal combustion engine vehicles, presenting a challenge for decarbonization. There growing interest in electric-drive vehicles as alternative to reduce CO2 local pollutant emissions road transport. In this research, vehicle stock turnover model used estimate the potential of energy consumption fleet; focusing on Japan case study. Base scenario, tank wheel are reduced 51.9% between 2012 2050 driven reduction, hybrid...
Internal combustion engine vehicles dominated road transport during the twentieth century. Nevertheless, panorama is likely to change in future, with electric-drive vehicle sales increasing due technology improvement, cost reduction, infrastructure development and environmental awareness. A new market model a stock turnover were combined estimate optimum composition of 2050 Japan under different scenarios; impact changes on light-duty fleet. The Base scenario by internal hybrid electric...
Cycle-by-cycle variations of natural gas direct injection (CNG DI) combustion were studied by using a rapid compression machine. Results show that CNG DI can realize high stability with less cycle-by-cycle variation in the maximum pressure rise, rate rise and heat release at given equivalence ratios. Mixture stratification fast flame propagation aid turbulence produced speed fuel jet are considered to be responsible for these behaviours. durations products present higher magnitudes than...
The characteristics of natural-gas direct-injection combustion under various fuel injection timings were studied by using a rapid compression machine. Results show that direct can result in is much faster than homogeneous while shortening the time interval between timing and ignition markedly decrease duration. Unburned hydrocarbon would increase over wide range equivalence ratios, value to homogeneous-mixture combustion. NO x level high but CO low ratios little affected timing. High values...
I N THE Japan Aerospace Exploration Agency (JAXA), a precooled turbojet engine specified for hypersonic propulsion is under development [1,2]. This uses precooling cycle using liquid hydrogen fuel, and it capable of accelerating vehicle from takeoff toMach 5. It planned that the takes off horizontally existing runways exhaust velocity supersonic throughout operation. Thus, jet noise suppression at one most important issues in development. At takeoff, nozzle pressure ratio (NPR) limited to...
Thrust measurement of a rectangular hypersonic nozzle employed in the precooled turbojet engine under development JapanAerospace Exploration Agency is carried out using an inclined baffle plate. A 1.0%-scaled model was manufactured, and its gross thrust investigated. The has variable throat external ramp to compensate drastic change pressure ratio through operation. At takeoff, intensive jet noise expected due high-speed exhaust jet, present study, impact aerodynamic-tab suppressors on...
A basic characteristics of compressed natural gas direct-injection (CNG DI) combustion was studied by using a rapid compression machine. Results show that comparing with homogeneous mixture, CNG DI has short duration, high pressure rise due to combustion, and rate heat release, which are considered come from the charge stratification flow generated fuel injection. can realize extremely lean reaches 0.03 equivalence ratio, φ. Combustion maximum efficiency found be insensitive injection modes....
<div class="htmlview paragraph">Characteristics of compressed natural gas (CNG) direct injection auto-ignition were investigated experimentally. A rapid compression machine (RCM) with the ratio 10 was used. The diameter and thickness combustion chamber are 80 mm 20 mm, respectively. After start, fuel directly injected a single hole injector at pressure 7.0 MPa, takes place. timing varied from 50 ms to 60 start. Two kinds gasses tested; 12A (CH4: 99.1 %) 13A 86.3 %, C2H6: 5.2 C3H8: 1.9 %...
In this paper we present the first stage of a study on effect early-closing intake-valve engine performance in spark-ignition engine. A four-valve single-cylinder was used with several values expansion ratio and half intake cam. The early closing leads to almost volumetric efficiency BMEP for all cases ratio. It can realize an improvement about 7% thermal under WOT, 4% partial load BMEP=0.2 MPa. These beneficial results are considered be mainly caused by more-expansion. compression ratios...
A study on the correlation of ignitability with fuel injection timing for direct combustion fuelled natural gas and gasoline was carried out by using a rapid compression machine. The pressure is 9 MPa 7 MPa. results show that possesses higher momentum than gasoline, this beneficial to enhancement since intensity turbulence could be induced. Correlation shows better behaviour in injection, insensitive modes case gas. Thus, would have engine applicability under cold-start conditions. lean burn...
A visualization study of natural gas direct injection combustion was carried out by using a high speed video camera. The results show that the distribution stratified mixture di ers with mode, parallel and single tending to form higher degree stratification than opposed injection. Flame propagates toward downstream direction in cases single-injection combustion, flame outward from centre chamber case combustion. characteristic turbulent wrinkled front is presented Super-lean can be realized...