scholarly journals THE METHOD OF TWO-PHASE MIXTURE FORMATION IN THE AUTOMOTIVE DIESEL ENGINE AND THE DEVICE FOR ITS IMPLEMENTATION

2021 ◽  
Author(s):  
М.D. Dubin ◽  
◽  
М.V. Ryblov ◽  
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Intake Manifold ◽  
Second Phase ◽  
Power Capacity ◽  
Mixture Formation ◽  
Two Phase ◽  
Phase Mixture ◽  
Ecological Parameters ◽  
Engine Power

The article offers the method of improving of the automotive diesel engine power capacity, fuel economy and ecological parameters by two-phase mixture formation. In this way, the first phase is performed by means of the fuel activator supply (dose 10-20 %) into the intake manifold. The second phase is performed by means of the main fuel dose by the standard fuel system. The design of the developed system for the implementation of the first phase of two-phase mixture formation is described.

scholarly journals THE DEVELOPMENT OF ELECTRONIC CONTROL ALGORITHM OF FUEL ACTIVATOR INJECTION AT TWO-PHASE MIXTURE FOR-MATION IN AUTOMOTIVE DIESEL ENGINE

2021 ◽  
Author(s):  
М.V. Ryblov ◽  
◽  
М.D. Dubin ◽  
Keyword(s):  
Diesel Engine ◽  
Control Algorithm ◽  
Electronic Control Unit ◽  
Control Unit ◽  
Intake Manifold ◽  
Electronic Control ◽  
Mixture Formation ◽  
Two Phase ◽  
Intake Stroke ◽  
Phase Mixture

The article presents an algorithm of automatic control of injection of fuel activator supplied at the intake stroke into the intake manifold at two-phase mixture formation in the diesel engine. The algorithm represents a command set written in the microcontroller program of electronic control unit of the system performing the injection of fuel activator at the first phase of two-phase mixture formation.

Two Phase Flow Simulation for Nucleate Boiling Heat Transfer Calculation in Waterjacket of Diesel Engine

2011 ◽  
Author(s):  
Arash Mohammadi ◽  
Hossein Hashemi ◽  
Ali Jazayeri ◽  
Mahdi Ahmadi
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Diesel Engine ◽  
Transfer Coefficient ◽  
Cylinder Head ◽  
Boiling Heat Transfer ◽  
Cooling System ◽  
Nucleate Boiling ◽  
Two Phase ◽  
Phase Mixture

Basic understanding of the process of coolant heat transfer inside an engine is an indispensable prerequisite to devise an infallible cooling strategy. Coolant flow and its heat transfer affect the cooling efficiency, thermal load of heated components, and thermal efficiency of a diesel engine. An efficient approach to study cooling system for diesel engine is a 3D computational fluid dynamics (CFD) calculation for coolant jacket. Therefore, computer simulation can analyze and consequently optimize cooling system performance, including complex cooling jacket. In this paper a computational model for boiling heat transfer based on two-phase Mixture model flow is established. Furthermore, the phenomenon of nucleate boiling, its mathematical modeling, and its effect on heat transfer is discussed. Besides, the static, total and absolute pressure, velocity and stream lines of the flow field, heat flux, heat transfer coefficient and volume fraction of vapor distribution in the coolant jacket of a four-cylinder diesel engine is computed. Also, comparison between experimental equation (Pflaum/Mollenhauer) and two-phase Mixture model for boiling hat transfer coefficient is done and good agreement is seen. In conclusion, it is observed that at high operating temperatures, nucleate boiling occurs in regions around the exhaust port. Numerical simulation of boiling heat transfer process of cooling water jacket and temperature field in the cylinder head of the diesel engine is compared with the data measured on the engine test bench. The calculated results indicate that this method can reflect the impact of boiling heat transfer on water jacket rather accurate. Therefore, this method is benefit to improve the computational precision in the temperature field computation of a cylinder head.

On the performance of a cascade of turbine rotor tip section blading in nucleating steam Part 3: Theoretical treatment

1997 ◽  
Vol 211 (3) ◽  
pp. 195-210 ◽  
Author(s):  
F Bakhtar ◽  
M R Mahpeykar
Keyword(s):  
Integral Method ◽  
Turbine Rotor ◽  
Main Flow ◽  
Theoretical Treatment ◽  
Viscous Effects ◽  
Mixture Formation ◽  
Two Phase ◽  
Time Marching ◽  
Phase Mixture ◽  
Improved Design

During the course of expansion in turbines, steam first supercools and then nucleates to become a two-phase mixture. Formation and subsequent behaviour of the liquid lower the performance of turbine wet stages. This is an area where greater understanding can lead to improved design. This paper describes the theoretical part of an investigation into nucleating flows of steam in a cascade of turbine rotor tip section blading. The main flow field is regarded as inviscid and treated by the time-marching technique modified to allow for two-phase effects. The viscous effects are assumed to be concentrated in boundary layers which are treated by the integral method. Comparisons are carried out with the experimental measurements presented in the earlier parts of the paper and the agreement obtained is good.

scholarly journals Simulation on engine characteristic improvement by re-designing intake manifold

2015 ◽  
Vol 18 (4) ◽  
pp. 31-38
Author(s):  
Toan Danh Vo ◽  
Cong Thanh Huynh
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Experimental Test ◽  
Evaluation Criteria ◽  
Volumetric Efficiency ◽  
Intake Manifold ◽  
Emission Characteristics ◽  
Cylinder Model ◽  
Di Diesel Engine ◽  
Engine Power

In this paper, a simulation of DI diesel engine 1 cylinder, model RV165-2 is used to investigate the effect of intake manifold design on the volumetric efficiency and characteristics by using AVL BOOST software. The proposed plans are evaluated and compared with available models. Conditions of simulation is based on the structure of engine and parameters from experimental test. The parameters of performance, combustion and emission characteristics are selected as evaluation criteria. The results of optimizing intake manifold are increasing volumetric efficiency, ability to blend the mixture of fuel and air, better combustion and increasing engine power, reducing fuel consumption and emission.

On the Performance of a Cascade of Turbine Rotor Tip Section Blading in Nucleating Steam: Part 1: Surface Pressure Distributions

1995 ◽  
Vol 209 (2) ◽  
pp. 115-124 ◽  
Author(s):  
F Bakhtar ◽  
M Ebrahimi ◽  
R A Webb
Keyword(s):  
Surface Pressure ◽  
Turbine Rotor ◽  
Pressure Measurements ◽  
Flow Conditions ◽  
Mixture Formation ◽  
Two Phase ◽  
Blow Down ◽  
Pressure Distributions ◽  
Phase Mixture

During the course of expansion in turbines, steam first supercools and then nucleates to become a two-phase mixture. Formation and subsequent behaviour of the liquid lower the performance of turbine wet stages. To reproduce turbine nucleating and wet flow conditions requires a supply of supercooled steam which can be achieved under blow-down conditions by the equipment employed. The performance of a cascade of rotor tip section blading in nucleating steam has been studied. The results of the surface pressure measurements are described in the paper.

A Comparison of Tem and Apfim to the Interpretation of Modulated Microstructures

1985 ◽  
Vol 43 ◽  
pp. 70-71
Author(s):  
M.G. Burke ◽  
M.K. Miller
Keyword(s):  
Low Temperature ◽  
Microstructural Characterization ◽  
Superlattice Reflection ◽  
High Volume ◽  
Atom Probe ◽  
Dark Field ◽  
Miscibility Gap ◽  
Second Phase ◽  
Two Phase ◽  
Probe Field

Interpretation of fine-scale microstructures containing high volume fractions of second phase is complex. In particular, microstructures developed through decomposition within low temperature miscibility gaps may be extremely fine. This paper compares the morphological interpretations of such complex microstructures by the high-resolution techniques of TEM and atom probe field-ion microscopy (APFIM).The Fe-25 at% Be alloy selected for this study was aged within the low temperature miscibility gap to form a <100> aligned two-phase microstructure. This triaxially modulated microstructure is composed of an Fe-rich ferrite phase and a B2-ordered Be-enriched phase. The microstructural characterization through conventional bright-field TEM is inadequate because of the many contributions to image contrast. The ordering reaction which accompanies spinodal decomposition in this alloy permits simplification of the image by the use of the centered dark field technique to image just one phase. A CDF image formed with a B2 superlattice reflection is shown in fig. 1. In this CDF micrograph, the the B2-ordered Be-enriched phase appears as bright regions in the darkly-imaging ferrite. By examining the specimen in a [001] orientation, the <100> nature of the modulations is evident.

THE DYNAMIC FRACTURE OF TWO PHASE ALLOYS WITH SECOND PHASE INCLUSIONS

1985 ◽  
Vol 46 (C5) ◽  
pp. C5-251-C5-255
Author(s):  
S. Pytel ◽  
L. Wojnar
Keyword(s):  
Dynamic Fracture ◽  
Second Phase ◽  
Two Phase
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