scholarly journals ANALYSIS OF AIR FLOW THROUGH THE ENGINE INTAKE AND EXHAUST DUCTS

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Zbigniew Czyż
Keyword(s):  
Diesel Engine ◽  
Numerical Analysis ◽  
Geometrical Model ◽  
Intake Manifold ◽  
Ansys Fluent ◽  
Flow Rates ◽  
Numerical Investigations ◽  
Mass Flow Rates ◽  
Flow Through ◽  
Stroke Engine

The paper presents numerical analysis of charge exchange in an opposed-piston two-stroke engine. The research engine is a newly designed internal diesel engine. This unit is composed of three cylinders in which operate three pairs of opposed-pistons. The numerical investigations were carried out using ANSYS FLUENT solver. The geometrical model includes an intake manifold, a cylinder and an outlet manifold. The calculations specified a swirl coefficient obtained under steady conditions for fully open intake and exhaust ports as well as the CA value of 280° for all cylinders. In addition, mass flow rates were identified separately in all of the intake and exhaust ports to achieve the best possible uniformity of flow in particular cylinders.

scholarly journals CFD Analysis of Charge Exchange in an Aircraft Opposed-Piston Diesel Engine

2019 ◽  
Vol 252 ◽  
pp. 04002 ◽  
Author(s):  
Zbigniew Czyż ◽  
Ksenia Siadkowska ◽  
Rafał Sochaczewski
Keyword(s):  
Diesel Engine ◽  
Charge Exchange ◽  
Exchange Process ◽  
Geometrical Model ◽  
Intake Manifold ◽  
Charge Exchange Process ◽  
Ansys Fluent ◽  
Mass Flow Rates ◽  
Crankshaft Rotation ◽  
Stroke Engine

The paper presents a description of geometric models, computational algorithms, and results of numerical analysis of charge exchange in an opposed-piston two-stroke engine. The research engine is a newly designed internal diesel engine. This unit is composed of three cylinders in which operate three pairs of opposed-pistons. The engine generates a power output equal to 100 kW at a crankshaft rotation speed of 3800-4000 rpm. The numerical investigations were carried out using ANSYS FLUENT solver. The geometrical model includes an intake manifold, a cylinder and an outlet manifold. The study was conducted for a series of modifications of manifolds and intake and exhaust ports to optimise the charge exchange process in the engine. In addition, we attempted to verify the effect of the combustion chamber shape on the charge exchange process in the engine. The calculations specified a swirl coefficient obtained under steady conditions for fully open intake and exhaust ports as well as the CA value of 280° for all cylinders. In addition, mass flow rates were identified separately in all of the intake and exhaust ports to achieve the best possible uniformity of flow in particular cylinders. The paper includes comparative analyses of all of the intake and exhaust manifolds of the designed engine.

scholarly journals Simulation and Modeling of Flow in a Gas Compressor

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Anna Avramenko ◽  
Alexey Frolov ◽  
Jari Hämäläinen
Keyword(s):  
Steady State ◽  
Mass Flow ◽  
Gas Flow ◽  
Simulation Method ◽  
High Mass ◽  
Ansys Fluent ◽  
Flow Rates ◽  
Mass Flow Rates ◽  
Low Mass ◽  
Flow Through

The presented research demonstrates the results of a series of numerical simulations of gas flow through a single-stage centrifugal compressor with a vaneless diffuser. Numerical results were validated with experiments consisting of eight regimes with different mass flow rates. The steady-state and unsteady simulations were done in ANSYS FLUENT 13.0 and NUMECA FINE/TURBO 8.9.1 for one-period geometry due to periodicity of the problem. First-order discretization is insufficient due to strong dissipation effects. Results obtained with second-order discretization agree with the experiments for the steady-state case in the region of high mass flow rates. In the area of low mass flow rates, nonstationary effects significantly influence the flow leading stationary model to poor prediction. Therefore, the unsteady simulations were performed in the region of low mass flow rates. Results of calculation were compared with experimental data. The numerical simulation method in this paper can be used to predict compressor performance.

Numerical Analysis of the Flow Inside a Centrifugal Compressor’s Vaneless Diffuser and Volute

2001 ◽  
Author(s):  
Hooman Rezaei ◽  
Abraham Engeda ◽  
Paul Haley
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
Mass Flow ◽  
Operating Conditions ◽  
Vaneless Diffuser ◽  
Flow Angle ◽  
Flow Rates ◽  
Mass Flow Rates ◽  
Minimum Medium ◽  
Good Agreement

Abstract The objective of this work was to perform numerical analysis of the flow inside a modified single stage CVHF 1280 Trane centrifugal compressor’s vaneless diffuser and volute. Gambit was utilized to read the casing geometry and generating the vaneless diffuser. An unstructured mesh was generated for the path from vaneless diffuser inlet to conic diffuser outlet. At the same time a meanline analysis was performed corresponding to speeds and mass flow rates of the experimental data in order to obtain the absolute velocity and flow angle leaving the impeller for those operating conditions. These values and experimental data were used as inlet and outlet boundary conditions for the simulations. Simulations were performed in Fluent 5.0 for three speeds of 2000, 3000 and 3497 RPM and mass flow rates of minimum, medium and maximum. Results are in good agreement with the experimental ones and present the flow structures inside the vaneless diffuser and volute.

A numerical analysis of the air flow through the IC engine intake manifold

2019 ◽  
Vol 19 (1) ◽  
pp. 63 ◽  
Author(s):  
Artur Cebula ◽  
Piotr �š ◽  
N.A. wiątek ◽  
Sebastian Kowalczyk
Keyword(s):  
Numerical Analysis ◽  
Air Flow ◽  
Intake Manifold ◽  
Ic Engine ◽  
Flow Through

Mass flow rate for nearly-free molecular slit flow

1969 ◽  
Vol 35 (3) ◽  
pp. 599-608 ◽  
Author(s):  
J. Daniel Stewart
Keyword(s):  
Mass Flow ◽  
Pressure Ratio ◽  
Molecular Flow ◽  
Two Dimensional ◽  
Flow Rates ◽  
Average Mass ◽  
Slit Flow ◽  
Mass Flow Rates ◽  
Flow Through ◽  
Tank Pressure

The local and average mass flow rates for nearly free molecular flow through a two-dimensional slit are determined for several tank pressure ratios. The equilibrium gas in the two tanks and the container walls are assumed to be at the same temperature and the Willis iterative method with the Bhatnager-Gross-Krook model is used for the analysis. The results for an infinite pressure ratio are also presented in order to illustrate the effects of a finite pressure ratio.

scholarly journals Experimental and Numerical Investigation the Effect of Grooves Impeller on Rotating Stall of High Speed Blower

2018 ◽  
Vol 8 (04) ◽  
Author(s):  
Muna S. Kassim ◽  
Fouad A. Saleh ◽  
Alaa Th. Aliwi
Keyword(s):  
Numerical Investigation ◽  
Mass Flow ◽  
High Speed ◽  
Static Pressure ◽  
Rotating Stall ◽  
High Mass ◽  
Ansys Fluent ◽  
Flow Rates ◽  
Frontal Wall ◽  
Mass Flow Rates

Experimental and numerical investigation to study the influence of add (one groove and two grooves) to the unshroud impeller onto the rotating stall as well fluctuations of pressure at a high speed blower of centrifugal. Experimental test rig which includes blower of centrifugal, transducer of pressure as well measurement instrumentations are constructed and designed for this study. A data acquisition system (hardware) as well its (software) have been developed into transferring the signal than transducer of pressure to the computer. The experimental work has been implemented through measuring the variation of static pressure as well fluctuation of pressure for two cases of the impeller (with one groove and with two grooves). Static pressure has been taken in different points arranged onto the frontal-wall of a volute casing along one track for two cases of the impeller. This track is angular track about the impeller. The results of experimental show that the fluctuations of pressure for different mass flow rates are nature of non-periodical and the mass flow rates decrease with the fluctuations of pressure increase. Also, the results indicate that the impeller with two grooves show high mass flow rates comparison with the impeller with one groove. Simulation of numerical has been implemented onto blower of centrifugal to analysis both field of flow as well fluctuations of pressure through using ANSYS (FLUENT 15). The simulation of numerical has been carried out through solve the continuity as well momentum equations with the moving reference framework technicality inside a blower. The numerical simulation results show good agreement with the results of experimental.

Air Flow Simulation in a Diesel Engine

2010 ◽  
Author(s):  
Joaqui´n Ferna´ndez ◽  
Alfonso Marcos ◽  
Rau´l Barrio ◽  
Eduardo Blanco ◽  
Alejandro Castilla
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Mass Flow ◽  
Air Flow ◽  
Flow Simulation ◽  
Intake Manifold ◽  
Experimental Measurements ◽  
Average Mass ◽  
Test Engine ◽  
Flow Through

The intake manifold of a Diesel engine is of significant importance. Several modifications are usually carried out in this system to increase the power generated without modifying the general design of the engine. This work presents a numerical and experimental investigation on the air flow in a commercial Diesel engine. The air average mass flow through the intake manifold was obtained experimentally for the D909 Deutz-Diter Diesel engine. Additionally, a numerical model was created for the test engine. The model reproduces the operating and boundary conditions of the flow and integrates the equations that describe the motion of the fluid. The average mass flow through the engine was obtained from the model and compared with the experimental measurements. The model was used subsequently to investigate the air flow within the engine.

Simulation of Subsonic Flow Through a Generic Labyrinth Seal

1986 ◽  
Vol 108 (4) ◽  
pp. 674-680 ◽  
Author(s):  
D. L. Rhode ◽  
S. R. Sobolik
Keyword(s):  
Subsonic Flow ◽  
Computer Code ◽  
Labyrinth Seal ◽  
Leakage Rate ◽  
Labyrinth Seals ◽  
Flow Rates ◽  
Mass Flow Rates ◽  
Flow Through ◽  
Carry Over ◽  
Single Cavity

A new method for predicting the leakage through labyrinth seals has been developed and is shown to provide realistic results which agree with measurements. It utilizes a finite-difference computer code which was developed in order to compute the pressure drop across a single cavity of the seal. This quantity is obtained at several leakage flow Mach numbers to be used subsequently in predicting the leakage rate. The model is widely applicable and does not require an estimate of the kinetic energy carry-over coefficient, whose value is often uncertain for many untested configurations. Detailed cavity distributions of basic flowfield quantities are also presented and examined. Specifically, the predicted results of four seal leakage mass flow rates at given cavity inlet pressure and temperature are compared, and important variations are examined. Also, realistic approximations of flow variable distributions within a single cavity are made from the included figures to assist in the development of analytical methods.

scholarly journals Effect due to Variation in Bend Angles of Intake Manifold on Turbulent Kinetic Energy for Diesel Engine

2020 ◽  
Vol 9 (5) ◽  
pp. 1979-1982
Keyword(s):  
Diesel Engine ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Intake Manifold ◽  
Bend Angle ◽  
Optimized Design ◽  
Ansys Fluent ◽  
Combustion Processes ◽  
Bend Angles ◽  
Work Done

One of the positive results for enhancing turbulence is to improve swirl, which is an important factor of air motion in a diesel engine. Other than enhancing mixing and improvement in combustion processes it also influences heat transfer, combustion quality, and engine raw emissions. To improve swirl intensities in-cylinder parameters like velocity, pressure, temperature and turbulence intensity are to be considered. There are two ways to create a swirl, modification in the intake system and valve design. So this work done contains modifications in the design of manifold to enhance turbulence during the intake stroke. Designs of manifold having different bend angle of 15o , 30o , 45o , 60o and 75o were used, all parts of numerical analysis were carried out on Ansys Fluent. The 200mm long intake model having a 20 mm diameter, with a bend on 160mm along length was used to find out the best bend angle configuration from the above orientations. K-epsilon model was used to simulate flow dynamics; variations turbulent kinetic energy was studied. After analyzing these results it was concluded that best-optimized design (in terms of turbulent kinetic energy) to get better swirl was for 75o . This work gives the understanding to find new techniques for further improvement in mixing by increasing turbulent kinetic energy. This work emphasizes on the techniques to enhance turbulent kinetic energy of any flow, and can also be applied to different fields related to mixing of fluids other than diesel engine

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