Study of propane gas explosion experiment and numerical analysis of flame arrestor design for LPG ship exhaust system

2020 ◽  
Vol 44 (1) ◽  
pp. 34-41
Author(s):  
Hoseong Yang ◽  
Hyeonsoo Park ◽  
Jihoon Park ◽  
Jeawon Eun ◽  
Youngho Lee
Keyword(s):  
Numerical Analysis ◽  
Exhaust System ◽  
Gas Explosion ◽  
Explosion Experiment

Numerical Analysis of Water Mist Flow Field for Gas Explosion Suppression in Upper Corner

2011 ◽  
Vol 71-78 ◽  
pp. 4848-4851
Author(s):  
Fan Mao Meng ◽  
Zhi Chao Liu ◽  
Zhi Zhong Liu
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Coal Mine ◽  
Water Mist ◽  
Gas Explosion ◽  
Gas Concentration ◽  
Methane Gas ◽  
Gas Accumulation ◽  
Explosion Suppression ◽  
Mist Flow

The water mist is an economical and environmental agent for gas explosion suppression. It can be applied in the commonly gas concentration zones and the gas accumulation zones which is difficult to reduce the concentration of methane gas. By numerical analysis, this paper studies the effect of the direction and the number of the nozzles, and the distance form the nozzles to the wall at X direction in upper corner in coal mine. For gas explosion suppression in upper corner, it can use one nozzle which direction is same as the wind and the distance is 2m.

scholarly journals A 1D–3D Approach for Fast Numerical Analysis of the Flow Characteristics of a Diesel Engine Exhaust Gas

Machines ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 239
Author(s):  
Kyeong-Ju Kong
Keyword(s):  
Diesel Engine ◽  
Numerical Analysis ◽  
Gas Flow ◽  
Emission Control ◽  
Flow Characteristics ◽  
Exhaust System ◽  
Exhaust Gas ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Control Devices

It is necessary to analyze the intake/exhaust gas flow of a diesel engine when turbocharger matching and when installing emission control devices such as exhaust gas recirculation (EGR), selective catalytic reduction (SCR), and scrubbers. Analyzing the intake/exhaust gas flow using a 3D approach can use various analytical models, but it requires a significant amount of time to perform the computation. An approach that combines 1D and 3D is a fast numerical analysis method that can utilize the analysis models of the 3D approach and obtain accurate calculation results. In this study, the flow characteristics of the exhaust gas were analyzed using a 1D–3D coupling algorithm to analyze the unsteady gas flow of a diesel engine, and whether the 1D–3D approach was suitable for analyzing exhaust systems was evaluated. The accuracy of the numerical analysis results was verified by comparison with the experimental results, and the flow characteristics of various shapes of the exhaust system of a diesel engine could be analyzed. Numerical analysis using the 1D–3D approach was able to be computed about 300 times faster than the 3D approach, and it was a method that could be used for research focused on the exhaust system. In addition, since it could quickly and accurately calculate intake/exhaust gas flow, it was expected to be used as a numerical analysis method suitable for analyzing the interaction of diesel engines with emission control devices and turbochargers.

Analysis for effect of pores on acoustic performance of reactive muffler

2021 ◽  
pp. 095745652110307
Author(s):  
Pravin P Hujare ◽  
Vishal R Mote ◽  
Ashok R Mache ◽  
Deepak P Hujare ◽  
Sandeep S Kore
Keyword(s):  
Numerical Analysis ◽  
Transmission Loss ◽  
Combustion Engine ◽  
Exhaust System ◽  
Noise Pollution ◽  
Engine Exhaust ◽  
Target Frequency ◽  
Acoustic Performance ◽  
Outlet Pipe ◽  
Exhaust Noise

The major source of noise pollution was an internal combustion engine. Henceforth, the design of the engine exhaust system was a tough challenge for automotive industries. The mufflers have been used to moderate the exhaust noise from the engine to the neighboring atmosphere. So in domestic as well as the industrial application, it is required to reduce noise levels to prevent human hazards. The performance of muffler is measured in terms of transmission loss. The transmission loss of reactive muffler is depending on its geometry. This article describes the effects of pores at the inlet pipe and outlet pipe of the reactive muffler on its performance capacity at a target frequency. It is found that the muffler performance is dependent on the number and position of pores. The single chamber and double chamber reactive mufflers are used for the study. The numerical analysis is performed by COMSOL Multiphysics software. The numerical analysis result of the different models of the muffler is compared with experimental analysis. The purpose of the study is to investigate the effect of pores in inlet and outlet pipe to maximize the TL at the target frequency of reactive muffler.

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