A Design of Cooling Water Jacket Structure and an Analysis of Its Coolant Flow Characteristics for a Horizontal Diesel Engine

2011 ◽  
Author(s):  
Jilin Lei ◽  
Lizhong Shen ◽  
Yuhua Bi ◽  
Jianming Chen
Keyword(s):  
Diesel Engine ◽  
Cooling Water ◽  
Flow Characteristics ◽  
Coolant Flow ◽  
Water Jacket

Application of PIV Measurements and Snapshot POD Analysis in a Cylinder Head of Diesel Engine

2017 ◽  
Author(s):  
Zhenyang Zhang ◽  
Hongwei Ma ◽  
Chao Jin ◽  
Cheng Xue ◽  
Yunlong Huang
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Total Energy ◽  
Cylinder Head ◽  
Flow Fields ◽  
Coolant Flow ◽  
Flow Structures ◽  
Fuel Injector ◽  
Piv Measurements ◽  
Water Jacket

The characteristic of coolant flow field in the water jacket of a cylinder head plays an important role in heat exchange, which could even influence the diesel engine’s performance and service life. Measurements and analysis methods to coolant flow field are limited by the complex internal geometrical structure of the cylinder head. In this paper, flow fields in a small and complicated spatial structure are measured by particle image velocimetry (PIV) system and the data are analyzed using proper orthogonal decomposition (POD) method. Time varying coolant flow structures located among two valve seats, a fuel injector seat and a side wall in a real cylinder head are measured by a two dimensional PIV system. PIV results of three measuring planes are displayed in different ways to show flow structures in the water jacket. Distinctive areas can be recognized easily in distributions of different flow parameters. A snapshot POD method is employed to analyze PIV data. Flow structures, which contain different amount of energy, are decomposed into different modes by POD method. POD Mode 1 and ensemble mean flow field are compared together and the relevance index shows a relatively high similarity between these two flow fields. The results also indicate a significant convergence of energy distribution. Energy contained in Mode 1 varies from 22% to 61% of the total energy in different measuring planes. 90% of the total energy is captured in top 10% of the total modes which belong to low-order modes. Energy in high-order modes, which occupy more than 60% of the total modes, contains less than 1% of the total energy. In summary, this paper presents the application of PIV measurements to coolant flow field in a real cylinder head and data processing using a snapshot POD method to analyze PIV results. A set of comprehensive properties showing the spatial and temporal characteristics of coolant flow structure is discussed and concluded detailedly. The data obtained can be used to build an experimental database to optimize coolant flow field structures and verify CFD numerical simulations in order to promote coolant flow passage design and simulation credibility of the diesel engine cooling system.

Numerical Investigation on Water Flow in Engine Cooling-Water Jacket

2013 ◽  
Vol 694-697 ◽  
pp. 689-692
Author(s):  
Zhi Xia He ◽  
Liang Zhang ◽  
Zhao Chen Jiang ◽  
Zhuang Shao
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Dead Zone ◽  
Cooling Water ◽  
The Other ◽  
Water Jacket ◽  
Engine Cooling ◽  
Field Distributions ◽  
Engine Cylinder ◽  
Good Flow

The engine cooling water jacket has a major impact on the efficiency of the engine. In this paper the flow in the cooling water jacket of the six-cylinder four stroke water-cooled diesel engine was studied with the commercial software of STAR CCM+. Results of the simulation reveals that velocity has little effect on the flow field distributions. Dead zone in engine cylinder head appeared far away from the inlet of the flow. But it could be avoided or improved effectively by arranging the inlet and outlet at opposite side of the cooling water jacket. Further study suggests that a good flow field distribution can be achieved near the entrance if one inlet was put at the same side of the outlet and the other the opposite side, while the wall was impacted fierce due to the strong turbulence and eddy existed. Finally some advices were given to solve the problem.

scholarly journals Numerical Simulation of Flow Field Characteristics of The Cooling Water Jacket of A Marine Diesel Engine

2021 ◽  
Vol 261 ◽  
pp. 02040
Author(s):  
Bo Zhang ◽  
Ping Zhang ◽  
Zhao Zhang ◽  
Shaobo Yang ◽  
Chengli Wang ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Cylinder Head ◽  
Cooling Water ◽  
Cylinder Block ◽  
Marine Diesel Engine ◽  
Water Jacket ◽  
Water Flows ◽  
Marine Diesel ◽  
Flow Field Characteristics

In order to evaluate the flow field characteristics of a marine diesel engine cooling water jacket, and provide a theoretical basis for further optimizing the water jacket structure. A computational fluid dynamics (CFD) method was used to calculate the three-dimensional flow field of the water jacket. Based on the CFD simulation model of the engine water jacket, the analysis of pressure field, velocity field, streamline distribution and flow uniformity of water jacket of diesel engine under rated condition were carried out. The results show that: the total pressure loss of water jacket is 30.3 kPa, in which the pressure loss of cylinder block is 8.4 kPa, and the one of cylinder head and outlet manifold is 21.9 kPa, which indicates that the flow resistance design of the cylinder block and head is reasonable; the flow rate of coolant in the nose zone of cylinder head is above 1.5 m/s, which meets the cooling demand of cylinder head; the cooling water flows circumferentially in the engine block water jacket, and the flow dead zones are easily formed by the mutual extrusion and collision of the water flows; the outlet of the cylinder head water jacket is connected with the outlet manifold at right angle, which leads to large energy loss of the flow field; the maximum non-uniformity of flow rate of water jacket of each cylinder is 5.85%, which can be further optimized by adjusting the position of water jacket inlet.

A low-temperature multi-effect desalination system powered by the cooling water of a diesel engine

Desalination ◽  
2017 ◽  
Vol 404 ◽  
pp. 112-120 ◽  
Author(s):  
Fengming Zhang ◽  
Shiming Xu ◽  
Dongdong Feng ◽  
Shunquan Chen ◽  
Ruxu Du ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Cooling Water

scholarly journals An Economical and Precise Cooling Model and Its Application in a Single-Cylinder Diesel Engine

2021 ◽  
Vol 11 (15) ◽  
pp. 6749
Author(s):  
Zhifeng Xie ◽  
Ao Wang ◽  
Zhuoran Liu
Keyword(s):  
Diesel Engine ◽  
Cooling System ◽  
Combustion Engine ◽  
Electronic Control Unit ◽  
Total Power ◽  
Dynamical Characteristic ◽  
Water Jacket ◽  
Single Cylinder ◽  
Pump Speed ◽  
Total Power Consumption

The cooling system is an important subsystem of an internal combustion engine, which plays a vital role in the engine’s dynamical characteristic, the fuel economy, and emission output performance at each speed and load. This paper proposes an economical and precise model for an electric cooling system, including the modeling of engine heat rejection, water jacket temperature, and other parts of the cooling system. This model ensures that the engine operates precisely at the designated temperature and the total power consumption of the cooling system takes the minimum value at some power proportion of fan and pump. Speed maps for the cooling fan and pump at different speeds and loads of engine are predicted, which can be stored in the electronic control unit (ECU). This model was validated on a single-cylinder diesel engine, called the DK32. Furthermore, it was used to tune the temperature of the water jacket precisely. The results show that in the common use case, the electric cooling system can save the power of 255 W in contrast with the mechanical cooling system, which is about 1.9% of the engine’s power output. In addition, the validation results of the DK32 engine meet the non-road mobile machinery China-IV emission standards.

scholarly journals Influence of twisted tape insert on the coolant flow characteristics in swirled film cooling

2021 ◽  
pp. 259-259
Author(s):  
Vashista Ademane ◽  
Ravikiran Kadoli ◽  
Vijaykumar Hindasageri
Keyword(s):  
Film Cooling ◽  
Flow Characteristics ◽  
Coolant Flow ◽  
Twisted Tape ◽  
Pumping Power ◽  
Pressure Losses ◽  
Jet Trajectory ◽  
Swirl Intensity ◽  
Cooling Behavior ◽  
Coefficient Of Discharge

The Present paper discusses film cooling behavior through numerical simulation in the presence of a twisted tape insert inside the film hole. The twisted tape insert imparts a swirl to the coolant flow. Coolant swirl intensity is controlled by varying the pitch of the twisted tape resulting in swirl numbers (S) of 0.0289, 0.116 and 0.168. The film cooling performance is evaluated using area-averaged effectiveness and heat transfer coefficient for blowing ratios of 0.5, 1.0, 1.5 and 2.0. Results revealed a significant amount of improvement in averaged effectiveness with the addition of swirl. Coolant swirl predominantly modifies the jet trajectory resulting in a reduced jet penetration and increased lateral expansion. Further investigation on the effect of twisted tape thickness on the coolant distribution has been found to be negligible. Pressure losses occurring due to the insertion of twisted tape inside the film hole is evaluated through the coefficient of discharge which indicated the necessity of higher pumping power than the film cooling case with no-swirl.

scholarly journals Design and Build Temperature Control and Monitoring in Diesel Engines Using Mobile

2020 ◽  
Vol 10 (1) ◽  
pp. 31-37
Author(s):  
Mohammad Hasan Fuadi
Keyword(s):  
Diesel Engine ◽  
Temperature Control ◽  
Diesel Engines ◽  
Temperature Sensor ◽  
Cooling System ◽  
Cooling Water ◽  
Solenoid Valve ◽  
Valve Opening ◽  
Opening And Closing ◽  
And Control

Diesel engines is generally used for industrial and agricultural machines. Few people care about the engine temperature so it is forced to reach temperature of 100oC, which causes overheating of the diesel engine and has an impact on the performance itself. This also uses a hopper cooling system which is certainly not effective, because it's necessary to see that the water in the reservoir is still or not, also not equipped with an engine temperature display so it's difficult to ascertain the temperature inside. This study aims to monitor and control the temperature of cooling water. Operation of temperature control uses a telecontrol system that is connected to network (Internet of Things) so diesel temperature control can be done remotely. Monitoring of temperature and water level in the reserve tank using Web Mobile. In addition, there is a temperature sensor that is used to measure the temperature of the cooling water so that users can monitor the temperature of the diesel engine on Web Mobile. The test results obtained, the temperature sensor has an average temperature reading error of 0.031004%. Diesel engines with controlled solenoid valve cooling systems can produce ideal temperatures compared to when the solenoid valve is open (using the radiator continuously) or when the solenoid valve is Closed (without using a radiator). When the solenoid is controlled the engine temperature can be ideal because the solenoid valve opening and closing system has the lowest temperature of 56.34oC and the highest temperature of only 80.85oC.

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