Optimization of intake and exhaust system of a gasoline engine based on genetic algorithm

2009 ◽  
Author(s):  
Yang Xiaolong ◽  
Huang Ming ◽  
Liu Biao
Keyword(s):  
Genetic Algorithm ◽  
Gasoline Engine ◽  
Exhaust System

Numerically Optimizing an Annular Diffuser Using a Genetic Algorithm With Three Objectives

2012 ◽  
Author(s):  
David J. Cerantola ◽  
A. M. Birk
Keyword(s):  
Genetic Algorithm ◽  
Pressure Loss ◽  
Total Pressure ◽  
Exhaust System ◽  
Outer Wall ◽  
Total Pressure Loss ◽  
Pressure Recovery ◽  
Annular Diffuser ◽  
Inlet Conditions ◽  
Wall Profile

A genetic algorithm was implemented to determine preferential solutions of a short annular diffuser exhaust system of length 1.5Do (outer annulus diameters). Five free variables defined the centre body shape and two variables determined the outer wall profile. Diffuser performance was evaluated using three objectives—(i) diffuser pressure recovery, (ii) outlet velocity uniformity, and (iii) total pressure loss—that were calculated from steady state solutions obtained using the computational fluid dynamics software FLUENT 13.0 with the realizable k-ε turbulence model and enhanced wall treatment. Inlet conditions were ReDh = 8.5 × 104 and M = 0.23. After thirty-five generations, a paraboloid-shaped centre body with length 0.74Do and initial annular expansion of approximately 14° produced preferential solutions. A configuration with a converging outer wall above the centre body developed greater outlet flow uniformity and lower total pressure loss whereas a straight outer wall followed by the solid diffuser generated more static pressure recovery.

A Vacuum-Compatible Air Bearing: Design Analysis and Optimization

2007 ◽  
Vol 339 ◽  
pp. 37-44 ◽  
Author(s):  
G.H. Khim ◽  
Chun Hong Park ◽  
H.S. Lee ◽  
S.W. Kim
Keyword(s):  
Genetic Algorithm ◽  
Exhaust System ◽  
Optimization Method ◽  
Vacuum Pump ◽  
Chamber Pressure ◽  
Design Parameters ◽  
Air Bearing ◽  
Great Care ◽  
Spatial Design ◽  
Bearing Design

This paper describes the vacuum-compatible air bearing designed with a cascaded exhaust scheme to minimize the leakage of air in a vacuum environment. The design of the air bearing, including the differential exhaust system, required great care because several design parameters, such as the number of exhaust stages, diameter and length of the exhaust tube, pumping speed and ultimate pressure of the vacuum pump, and seal length and gap greatly influenced the leakage of air and thus the degree of vacuum. A leakage analysis was performed to estimate the chamber pressure and an optimization method based on the genetic algorithm was proposed under several constraint conditions. The results showed that the degree of vacuum improved dramatically compared to the initial design, and that the distribution of the spatial design parameters and technical limit of the pumping speed were well achieved.

scholarly journals Vehicle speed influence on exhaust system surface temperature

2021 ◽  
Vol 18 (2) ◽  
pp. 192-202
Author(s):  
M. G. Boiarshinov ◽  
N. I. Kuznetsov
Keyword(s):  
Experimental Study ◽  
Surface Temperature ◽  
Ambient Temperature ◽  
Gasoline Engine ◽  
Experimental Studies ◽  
Exhaust System ◽  
Climatic Conditions ◽  
Constant Speed ◽  
Vehicle Speed ◽  
Low Ambient Temperature

Introduction. The reasons for the formation of an increased amount of condensate in the exhaust system of a car at a low ambient temperature are considered. Since the speed of the vehicle is one of the factors that determine the heating of the exhaust system and the formation of condensation, an experimental study was carried out to determine the temperature of the elements of the exhaust system at various vehicle speeds.The purpose of this study: to establish the features of the temperature change of individual elements of the exhaust system, depending on time at different vehicle speedsMaterials and methods. The sequence of the experimental study consisted of starting the “cold” engine, accelerating the car and then moving the car at a constant speed for 20 minutes. Simultaneously with the start of the engine, the temperature of the elements of the exhaust system was recorded. In this study, thermocouples were used to measure the surface temperature of the exhaust system. Experimental studies were carried out on a Toyota Camry with a gasoline engine in the climatic conditions of the Perm Territory.Results. The dependences of the temperature of the exhaust system elements on time were obtained at different speeds. In an experimental study, it was found that the temperature of the elements of the exhaust system is established within 8-12 minutes from the start of the vehicle at a constant speed; the rear muffler has the least surface heating, and therefore the greatest probability of the formation and accumulation of condensate.Discussion and conclusion. The analysis of the peculiarities of the change in the temperature of the exhaust system during the movement of the vehicle in conditions of low ambient temperature is carried out. The established patterns can be used to obtain information on the processes of condensate accumulation in the exhaust system and are aimed at predicting the amount of condensate accumulation in the exhaust system; to develop new solutions to ensure reliable operation of the exhaust system.

Electromagnetic valve train for gasoline engine exhaust system

2016 ◽  
Vol 17 (3) ◽  
pp. 361-367 ◽  
Author(s):  
X. Y. Fan ◽  
L. Liu ◽  
S. Q. Chang ◽  
J. T. Xu ◽  
J. G. Dai
Keyword(s):  
Gasoline Engine ◽  
Exhaust System ◽  
Valve Train ◽  
Engine Exhaust ◽  
Electromagnetic Valve

scholarly journals Research for intake and exhaust system parameterization of 2-cylinder gasoline engine for RE-EV

2018 ◽  
Vol 42 (13) ◽  
pp. 4256-4256 ◽  
Author(s):  
Jinyoung Jang ◽  
Youngmin Woo ◽  
Yongjin Jung ◽  
Chongpyo Cho ◽  
Gangchul Kim ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
Exhaust System

Aerodynamic Shape Optimization of Air-Intakes of a Helicopter Turboshaft

2012 ◽  
Author(s):  
A. Garavello ◽  
M. Russo ◽  
Claudio Comis da Ronco ◽  
R. Ponza ◽  
E. Benini
Keyword(s):  
Genetic Algorithm ◽  
Shape Optimization ◽  
Total Pressure ◽  
Evolutionary Process ◽  
Exhaust System ◽  
Interface Plane ◽  
Shape Optimisation ◽  
Efficient Design ◽  
Multi Objective ◽  
Turboshaft Engine

The research project HEAVYcOPTer, a sub task of the European R&D program Clean-Sky GRC2 [1], is devoted to the efficient design and the shape optimization of the Agusta Westland AW101 helicopter turboshaft engine intake and exhaust system, to be carried out by means of advanced multi-objective optimization algorithms coupled with CFD Navier-Stokes solvers. The present paper describes the outcomes of HEAVYcOPTer in relation to the air intakes shape optimisation activities. This paper describes the technical details of such program. The optimisation method chosen for the redesign of the engine installation involves the application of the state of the art genetic algorithm GDEA, developed at the University of Padova and successfully applied in several fluid-dynamics applications, especially in the field of turbomachinery. For the present application, the set of geometrical designs constituting the genetic algorithm population are generated by means of morphing the original CFD model surface mesh: shapes are applied to baseline surface nodes with a displacement intensity driven by the GA chosen scaling factors. Then, CFD models of new designs are automatically generated and analyzed by the flow solver, returning to the GA the evaluation of the selected objective functions required in order to evolve the population in the next step of the evolutionary process. AW101 intakes have been optimised following a multi-objective/multi-point approach, minimizing inlet total pressure loss in both hovering and forward flight conditions simultaneously; optimised solutions were also constrained so as to not exceed the total pressure distortion level at the engine aerodynamic interface plane, so as to ensure inlet/engine compatibility with respect to the compressor surge limit. This approach ensured the improvement of the engine/airframe integration efficiency for the overall rotorcraft flight envelop, reducing fuel burn and increasing the helicopter propulsive efficiency.

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