Influence of Rain Protection Louver on the Noise Generated by Ship Engine Room Air Intake

2008 ◽  
Author(s):  
Manoj Kumar ◽  
S. L. Nikam
Keyword(s):  
Flow Field ◽  
Parametric Study ◽  
Noise Level ◽  
Supply System ◽  
Current Work ◽  
Significant Source ◽  
Angular Orientation ◽  
Engine Room ◽  
Air Supply ◽  
Air Intake

The air supply system, of a ship engine room, is a tremendous source of noise. Apart from the noise from air-intake fan, the rain protection louver, which guides the airflow and protects the fan and the duct from rain, is also a significant source of noise. The influence of the air-intake louver, on the noise generated by the engine room air-intake, has been studied by numerically simulating the flow field as well as on the basis of on-board measurements and simple experiments. In order to analyze the noise generated by the louver, a parametric study has been carried out based on two variables, the angular orientation of the slats of the louver and the spacing between the slats. The study shows that the noise level reduces significantly by changing the angular orientation of the slats, making them inline with the flow. It is also observed that, by increasing the spacing between the slats, the noise level can be reduced. The current work is a part of a study to develop guidelines to limit noise level, due to engine room air intake, on-board a ship.

Air Supply System Optimization for the Multi-Temperature Refrigerated Trucks

2013 ◽  
Vol 546 ◽  
pp. 35-39
Author(s):  
Jia Min Wang ◽  
X.X. Zhao ◽  
L.J. Li ◽  
C.Z. Huang ◽  
Z. L. Jiang
Keyword(s):  
Wind Speed ◽  
Flow Field ◽  
System Optimization ◽  
Supply System ◽  
Agricultural Products ◽  
Marketing Mode ◽  
Air Supply ◽  
Small Production

The multi-temperature refrigerated trucks which can transport a variety of goods at the same time, meet the requirement of production and marketing mode of “small production/big market” for Chinese agricultural products. In this paper, the multi-temperature refrigerated trucks with sidewall air duct and bottom return rail were selected to simulate the effect of air outlet locations and wind speed on the flow field of the carriage. The layout of the air outlet location and the wind speed was optimized accordingly.

scholarly journals A Brief Theoretical Analysis on the Ventilation Characteristics of the Multi-Intake-Well Air Supply System in a Spillway Tunnel

2019 ◽  
Vol 9 (14) ◽  
pp. 2793
Author(s):  
Jijian Lian ◽  
Panhong Ren ◽  
Chunfeng Qi ◽  
Fang Liu ◽  
Qunan Ouyang
Keyword(s):  
Drag Coefficient ◽  
Theoretical Approach ◽  
Supply System ◽  
Structural Factors ◽  
Air Supply ◽  
Air Intake ◽  
Spillway Tunnel ◽  
High Dams ◽  
Supply Systems ◽  
Theoretical Results

It is of great significance to study the ventilation characteristics of air supply systems in spillway tunnels, especially for high dams. In this paper, a brief theoretical approach to evaluate the ventilation characteristics of a multi-intake-well air supply system was established, which was mainly derived from the Bernoulli equation and continuity equation. With this approach, an analysis of the ventilation characteristics of the Jinping-I project spillway tunnel was carried out. A comparison of the theoretical results and prototype data suggested the theoretical approach to be valid and practical. The value of the drag coefficient at the air-water interface should be calibrated before evaluation because the drag coefficient is crucial for the accuracy of theoretical results. In addition, the influences of certain structural factors of the spillway tunnel and air intake well on the ventilation characteristics of multi-intake-well air supply systems are investigated.

Thermal and mechanical improvement of the air supply system of a turbocharged piston engine

2021 ◽  
Vol 14 (2) ◽  
pp. 108-114
Author(s):  
Y. M. Brodov ◽  
L. V. Plotnikov ◽  
K. O. Desyatov
Keyword(s):  
Heat Transfer ◽  
Experimental Studies ◽  
Local Heat Transfer ◽  
Supply System ◽  
Scale Model ◽  
Piston Engine ◽  
Intake System ◽  
Gas Dynamic ◽  
Air Supply ◽  
Air Flows

A method of thermomechanical improvement of pulsating air flows in the intake system of a turbocharged piston engine is described. The main objective of this study is to develop a method for suppressing the rate of heat transfer to improve the reliability of a piston turbocharged engine. A brief review of the literature on improving the reliability of piston engines is given. Scientific and technical results were obtained on the basis of experimental studies on a full-scale model of a piston engine. The hot-wire anemometer method was used to obtain gas-dynamic and heatexchange characteristics of gas flows. Laboratory stands and instrumentation facilities are described in the article. The data on gas dynamics and heat exchange of stationary and pulsating air flows in gas-dynamic systems of various configurations as applied to the air supply system of a turbocharged piston engine are presented. A method of thermomechanical improvement of flows in the intake system of an engine based on a honeycomb is proposed in order to stabilize the pulsating flow and suppress the intensity of heat transfer. Data were obtained on the air flow rate and the local heat transfer coefficient both in the exhaust duct of the turbocharger compressor (i.e., without a piston engine) and in the intake system of a supercharged engine. A comparative analysis of the data has been carried out. It was found that the installation of a leveling grid in the exhaust channel of a turbocharger leads to an intensification of heat transfer by an average of 9%. It was found that the presence of a leveling grid in the intake system of a piston engine causes the suppression of heat transfer within 15% in comparison with the baseline values. It is shown that the use of a modernized intake system in a diesel engine increases its probability of failure-free operation by 0.8%. The data obtained can be extended to other types and designs of air supply systems for heat engines.

STUDY ON THE OPTIMIZATION FOR THE SIZE OF FUEL CELL FLOW FIELD UNDER INADEQUATE AIR SUPPLY CONDITION

Química Nova ◽  
2021 ◽  
Author(s):  
Shi Lei ◽  
Zheng Minggang
Keyword(s):  
Fuel Cell ◽  
Flow Field ◽  
Proton Exchange Membrane ◽  
Three Dimensional ◽  
Proton Exchange ◽  
Field Size ◽  
Air Supply ◽  
Supply Condition ◽  
Length Width ◽  
Exchange Membrane

In this paper, the influence of the optimization for flow field size on the proton exchange membrane fuel cell (PEMFC) performance under the inadequate air supply of cathode was studied based on the three-dimensional, steady-state, and constant temperature PEMFC monomer model. Additionally, the effect of the optimization for hybrid factors, including length, width, depth and width-depth, on the PEMFC performance was also investigated. The results showed that the optimization of the flow field size can improve the performance of the PEMFC and ensure that it is close to the level under the normal gas supply.

Compressed air supply system of vibro‐isolated tools

1992 ◽  
Vol 91 (5) ◽  
pp. 3083-3083
Author(s):  
Marian W. Dobry ◽  
Czeslaw Cempel ◽  
Wieslaw Garbatowski
Keyword(s):  
Supply System ◽  
Compressed Air ◽  
Air Supply
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