Experimental Study on Effect of Hot EGR on Combustion Characteristic of HICE under High Load Conditions

2012 ◽  
Vol 562-564 ◽  
pp. 1024-1027
Author(s):  
Xing Hua Liu ◽  
Dao Jing Wang ◽  
Fu Shui Liu
Keyword(s):  
Experimental Study ◽  
Combustion Engine ◽  
High Load ◽  
Intake Manifold ◽  
Combustion Characteristic ◽  
Test Results ◽  
Hydrogen Flow ◽  
Indicated Mean Effective Pressure ◽  
Quality Regulation ◽  
Load Conditions

In order to study the effect of hot EGR on combustion characteristic of hydrogen internal combustion engine (HICE), experimental study was taken on a 4 cylinder, 2.0L HICE. The speed was 3000rpm, and the throttle was fully open, the load was adjusted through quality regulation. When the hydrogen flow ratio was 2.79kg /h, the ignition advanced angle was optimized as maximum brake torque (MBT) timing, then the EGR valve was opened, and EGR valve was adjusted to control the flow of exhaust gas that back into the intake manifold. The test results show that: as the EGR ratio changing from 0(the EGR valve is fully closed) to 43.8%(the EGR valve is fully opened), the in-cylinder pressure is decreasing with the EGR ratio increasing; the coefficient of variation in indicated mean effective pressure (imepCOV) is not changing significantly at high load conditions, changing range is less than 1%; CA50 is postponed from 11.8oCAto15.2 oCA with EGR ratio increasing.

scholarly journals Evaluation of exhaust gas recirculation techniques on a high-speed direct injection diesel engine using first law analysis

2018 ◽  
Vol 233 (3) ◽  
pp. 710-726 ◽  
Author(s):  
Nick Papaioannou ◽  
Felix CP Leach ◽  
Martin H Davy ◽  
Adam Weall ◽  
Brian Cooper
Keyword(s):  
High Speed ◽  
Direct Injection ◽  
Exhaust Gas Recirculation ◽  
High Load ◽  
Exhaust Gas ◽  
Indicated Mean Effective Pressure ◽  
Energy Flows ◽  
Baseline Case ◽  
Gas Recirculation ◽  
Load Conditions

The effects of different exhaust gas recirculation (EGR) strategies on engine efficiency and the resulting energy flows at two speed/load conditions (1500 r/min/6.8 bar net indicated mean effective pressure (nIMEP) and 1750 r/min/13.5 bar nIMEP) were studied using a first law analysis approach. The EGR strategies tested were as follows: cooled high-pressure exhaust gas recirculation (baseline), the application of exhaust gas recirculation with the swirl flap closed and the use of exhaust gas recirculation under constant λ conditions. The closed swirl flap exhaust gas recirculation strategy reduced brake efficiency under high load conditions and increased heat transfer to the coolant for both load cases. Soot and CO emissions increased at high load, however, with an increase in NOx relative to the baseline case. The constant λ exhaust gas recirculation strategy reduced brake efficiency under low load, as well as the heat flow to the coolant for both load cases. The constant λ exhaust gas recirculation strategy benefited smoke emissions and increased combustion exhaust gas recirculation tolerance, albeit with a penalty in NOx emission.

NUMERICAL AND EXPERIMENTAL STUDY OF PRESSURE LOSS AT THE INTAKE MANIFOLD OF A FORMULA-SAE VEHICLE

2017 ◽  
Author(s):  
ALVARO ROCHA ◽  
Luan Correia ◽  
Raimundo Duarte ◽  
Emerson da Trindade Marcelino
Keyword(s):  
Experimental Study ◽  
Pressure Loss ◽  
Intake Manifold ◽  
Formula Sae

Experimental study on grain failure of lightweight expanded clay aggregate under uniaxial and biaxial load conditions

2021 ◽  
Vol 383 ◽  
pp. 542-553
Author(s):  
Elías A. Roces-Alonso ◽  
Jesús González-Galindo ◽  
José Estaire
Keyword(s):  
Experimental Study ◽  
Biaxial Load ◽  
Load Conditions

scholarly journals Experimental Study on Improvement of Marine Soft Soil with Alkali Residue

2018 ◽  
Vol 53 ◽  
pp. 04021
Author(s):  
SHAO Yong ◽  
LIU Xiao-li ◽  
ZHU Jin-jun
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Void Ratio ◽  
Soft Soil ◽  
Compressive Modulus ◽  
Engineering Properties ◽  
Test Results ◽  
Use Of Resources ◽  
One Year

Industrial alkali slag is the discharge waste in the process of alkali production. About one million tons of alkali slag is discharged in China in one year. It is a burden on the environment, whether it is directly stacked or discharged into the sea. If we can realize the use of resources, it is a multi-pronged move, so alkali slag is used to improve solidified marine soft soil in this paper. The test results show that the alkali residue can effectively improve the engineering properties of marine soft soil. Among them, the unconfined compressive strength and compressive modulus are increased by about 10 times, and the void ratio and plasticity index can all reach the level of general clay. It shows that alkali slag has the potential to improve marine soft soil and can be popularized in engineering.

Performance Analysis of the Test Results on a Two-Stage Transonic Fan

1983 ◽  
Vol 105 (1) ◽  
pp. 125-129
Author(s):  
Baoshi Chen ◽  
Tianyi Zhang
Keyword(s):  
Mach Number ◽  
Performance Analysis ◽  
Radial Distribution ◽  
Flow Separation ◽  
High Load ◽  
Test Results ◽  
Two Stage ◽  
Stall Margin ◽  
High Incidence ◽  
Transonic Fan

Test results obtained from a two-stage fan are analysed and the reasons that caused the design performance target not to be attained are presented in this paper. Addition of a partspan shroud on rotor 1 caused higher losses and changed radial distribution of parameters. Modification on the flowpath and chord length of stator 1 resulted in excessively high inlet Mach number and flow separation in the hub region. The high load and high incidence at the hub of rotor 2 caused higher losses and reduced stall margin of the fan.

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