Characteristics of Heat Release History of Multi-Hole Diesel Spray Affected by Initial Mixture Formation, Wall Impingement and Spray Interaction

2020 ◽  
Author(s):  
Yoshiyuki Kidoguchi ◽  
Masaya Ono ◽  
Yuya Noda ◽  
Yuzuru Nada
Keyword(s):  
Heat Release ◽  
Initial Mixture ◽  
Diesel Spray ◽  
Mixture Formation ◽  
Wall Impingement ◽  
History Of

An Improved Rate of Heat Release Model for Modern High-Speed Diesel Engines

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Peter G. Dowell ◽  
Sam Akehurst ◽  
Richard D. Burke
Keyword(s):  
Heat Release ◽  
Diesel Engines ◽  
Engine Speed ◽  
Fuel Injection ◽  
Maximum Pressure ◽  
Injection Model ◽  
Wall Impingement ◽  
Small Set ◽  
Rate Of Heat Release ◽  
Engine System

To meet the increasingly stringent emissions standards, diesel engines need to include more active technologies with their associated control systems. Hardware-in-the-loop (HiL) approaches are becoming popular where the engine system is represented as a real-time capable model to allow development of the controller hardware and software without the need for the real engine system. This paper focusses on the engine model required in such approaches. A number of semi-physical, zero-dimensional combustion modeling techniques are enhanced and combined into a complete model, these include—ignition delay, premixed and diffusion combustion and wall impingement. In addition, a fuel injection model was used to provide fuel injection rate from solenoid energizing signals. The model was parameterized using a small set of experimental data from an engine dynamometer test facility and validated against a complete data set covering the full engine speed and torque range. The model was shown to characterize the rate of heat release (RoHR) well over the engine speed and load range. Critically, the wall impingement model improved R2 value for maximum RoHR from 0.89 to 0.96. This was reflected in the model's ability to match both pilot and main combustion phasing, and peak heat release rates derived from measured data. The model predicted indicated mean effective pressure and maximum pressure with R2 values of 0.99 across the engine map. The worst prediction was for the angle of maximum pressure which had an R2 of 0.74. The results demonstrate the predictive ability of the model, with only a small set of empirical data for training—this is a key advantage over conventional methods. The fuel injection model yielded good results for predicted injection quantity (R2 = 0.99) and enabled the use of the RoHR model without the need for measured rate of injection.

Vortex Development and Heat Release Enhancement in Diesel Spray Flame by Inversed-Delta Injection Rate Shaping Using TAIZAC Injector

2021 ◽  
Author(s):  
Tetsuya Aizawa ◽  
Tomoki Kinoshita ◽  
Yohei Tanaka ◽  
Tatsuki Takahashi ◽  
Yuusei Miyagawa ◽  
...  
Keyword(s):  
Heat Release ◽  
Injection Rate ◽  
Diesel Spray ◽  
Spray Flame ◽  
Rate Shaping

scholarly journals LES Analysis of Mixture Formation and Ignition in a Diesel Spray

2012 ◽  
Vol 78 (787) ◽  
pp. 652-662 ◽  
Author(s):  
Hirokazu KOJIMA ◽  
Hiroshi KAWANABE ◽  
Takuji ISHIYAMA
Keyword(s):  
Diesel Spray ◽  
Mixture Formation

LES Analysis of Mixture Formation and Combustion Processes in a Diesel Spray

2011 ◽  
Vol 5 (2) ◽  
pp. 102-111 ◽  
Author(s):  
Hirokazu Kojima ◽  
Hiroshi Kawanabe ◽  
Takuji Ishiyama
Keyword(s):  
Diesel Spray ◽  
Mixture Formation ◽  
Combustion Processes

Quasi-Dimensional Diesel Engine Combustion Modeling With Improved Diesel Spray Tip Penetration, Ignition Delay, and Heat Release Submodels

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Shuonan Xu ◽  
Hirotaka Yamakawa ◽  
Keiya Nishida ◽  
Zoran Filipi
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Diesel Engines ◽  
Ignition Delay ◽  
Air Entrainment ◽  
Oxygen Mixture ◽  
Diesel Spray ◽  
Spray Tip Penetration ◽  
Simulation Tools ◽  
The Impact

Increasingly stringent fuel economy and CO2 emission regulations provide a strong impetus for development of high-efficiency engine technologies. Diesel engines dominate the heavy duty market and significant segments of the global light duty market due to their intrinsically higher thermal efficiency compared to spark-ignited (SI) engine counterparts. Predictive simulation tools can significantly reduce the time and cost associated with optimization of engine injection strategies, and enable investigation over a broad operating space unconstrained by availability of prototype hardware. In comparison with 0D/1D and 3D simulations, Quasi-Dimensional (quasi-D) models offer a balance between predictiveness and computational effort, thus making them very suitable for enhancing the fidelity of engine system simulation tools. A most widely used approach for diesel engine applications is a multizone spray and combustion model pioneered by Hiroyasu and his group. It divides diesel spray into packets and tracks fuel evaporation, air entrainment, gas properties, and ignition delay (induction time) individually during the injection and combustion event. However, original submodels are not well suited for modern diesel engines, and the main objective of this work is to develop a multizonal simulation capable of capturing the impact of high-injection pressures and exhaust gas recirculation (EGR). In particular, a new spray tip penetration submodel is developed based on measurements obtained in a high-pressure, high-temperature constant volume combustion vessel for pressures as high as 1450 bar. Next, ignition delay correlation is modified to capture the effect of reduced oxygen concentration in engines with EGR, and an algorithm considering the chemical reaction rate of hydrocarbon–oxygen mixture improves prediction of the heat release rates. Spray and combustion predictions were validated with experiments on a single-cylinder diesel engine with common rail fuel injection, charge boosting, and EGR.

scholarly journals Thermodynamic Properties of Real Porous Combustion Reactor under Diesel Engine-Like Conditions

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
M. Weclas ◽  
J. Cypris ◽  
T. M. A. Maksoud
Keyword(s):  
Heat Capacity ◽  
Diesel Engine ◽  
Heat Release ◽  
Combustion Chamber ◽  
Free Volume ◽  
Initial Pressure ◽  
Mixture Formation ◽  
Release Process ◽  
Formation Conditions ◽  
Combustion Reactor

Thermodynamic conditions of the heat release process under Diesel engine-like conditions in a real porous combustion reactor simulated in a special combustion chamber were analyzed. The same analyses were performed for a free volume combustion chamber, that is, no porous reactor is applied. A common rail Diesel injection system was used for simulation of real engine fuel injection process and mixture formation conditions. The results show that thermodynamic of the heat release process depends on reactor heat capacity, pore density, specific surface area, and pore structure, that is, on heat accumulation in solid phase of porous reactor. In real reactor, the gas temperature and porous reactor temperature are not equal influenced by initial pressure and temperature and by reactor parameters. It was found that the temperature of gas trapped in porous reactor volume during the heat release process is less dependent on air-to-fuel-ratio than that observed for free volume combustion chamber, while the maximum combustion temperature in porous reactor is significantly low. As found this temperature depends on reactor heat capacity, mixture formation conditions and on initial pressure. Qualitative behavior of heat release process in porous reactors and in free volume combustion chamber is similar, also the time scale of the process.

G070026 Effects of Mixture Formation of Diesel Spray on Exhaust Characteristic under Supercharging Conditions

2012 ◽  
Vol 2012 (0) ◽  
pp. _G070026-1-_G070026-5
Author(s):  
Yusuke KOMATSUBARA ◽  
Fumihiko UYAMA ◽  
Yuzuru NADA ◽  
Yoshiyuki KIDOGUCHI
Keyword(s):  
Diesel Spray ◽  
Mixture Formation

An Analysis of Combustion Knock in a Diesel Engine

1969 ◽  
Vol 184 (10) ◽  
pp. 62-66 ◽  
Author(s):  
M. Ikegami ◽  
F. Nagao
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Present Model ◽  
Combustion Model ◽  
Adequate Explanation ◽  
Early Stages ◽  
History Of ◽  
Combustion Knock ◽  
Varying Delay

To permit the prediction of the history of heat release during the early stages of combustion a combustion model is presented. This model is based on the concept of a varying delay mechanism which was proposed by the present authors in a previous paper. In the present paper, some refinement of this model is attained by taking several factors into account. A number of examples have been investigated both theoretically and experimentally and the results compared. The results show that the present model gives an adequate explanation of diesel knock and related matters.

Spray Wall-Impingement from a Single Hole Nozzle under Common Rail Condition

2011 ◽  
Vol 347-353 ◽  
pp. 770-773 ◽  
Author(s):  
Zhan Cheng Wang ◽  
Hui Yong Du ◽  
Jian Xin Liu ◽  
Liang Han ◽  
Song Liu
Keyword(s):  
Combustion Process ◽  
Common Rail ◽  
Small Scale ◽  
Rail Pressure ◽  
Mixture Formation ◽  
Common Rail Pressure ◽  
Wall Impingement ◽  
Inclination Angles ◽  
Spray Impingement ◽  
Made In

In the middle and small scale diesel engine, the interaction between the spray wall-impingement and air motion plays a fundamental role on the mixture formation process, it also greatly influences the combustion process and the exhaust emissions. An experimental setup for spray impingement visualization has been made in this paper, the influences of common rail pressure and variable inclination angles on spray impingement are investigated. The experimental results show that the splashing volume increases according to the increasing common rail pressure, and the better atomization is achieved. As for variable inclination angle of spray, the upstream of impingement spray decreases and the downstream increases with the increase of inclination of the wall, the change of entrainment is hardly detected, but the overall splashing volume increases slightly.

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