scholarly journals A Design of the Compression Chamber and Optimization of the Sealing of a Novel Rotary Internal Combustion Engine Using CFD

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2362
Author(s):  
Savvas Savvakis ◽  
Dimitrios Mertzis ◽  
Elias Nassiopoulos ◽  
Zissis Samaras
Keyword(s):  
Internal Combustion Engine ◽  
Cfd Simulation ◽  
Combustion Engine ◽  
Numerical Study ◽  
Simulation Models ◽  
Internal Combustion ◽  
Intake Port ◽  
Significant Difference ◽  
Port Design ◽  
Compression Chamber

The current paper investigates two particular features of a novel rotary split engine. This internal combustion engine incorporates a number of positive advantages in comparison to conventional reciprocating piston engines. As a split engine, it is characterized by a significant difference between the expansion and compression ratios, the former being higher. The processes are decoupled and take place simultaneously, in different chambers and on the different sides of the rotating pistons. Initially, a brief description of the engine’s structure and operating principle is provided. Next, the configuration of the compression chamber and the sealing system are examined. The numerical study is conducted using CFD simulation models, with the relevant assumptions and boundary conditions. Two parameters of the compression chamber were studied, the intake port design (initial and optimized) and the sealing system size (short and long). The best option was found to be the combination of the optimized intake port design with the short seal, in order to keep the compression chamber as close as possible to the engine shaft. A more detailed study of the sealing system included different labyrinth geometries. It was found that the stepped labyrinth achieves the highest sealing efficiency.

Numerical study of fluid dynamic flow within an internal combustion engine cylinder

2017 ◽  
Author(s):  
Ana Marta Souza ◽  
Antônio César Valadares de Oliveira ◽  
Enrico Temporim Ribeiro ◽  
Francisco Souza ◽  
Marcelo Colombo Chiari
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Numerical Study ◽  
Fluid Dynamic ◽  
Internal Combustion ◽  
Dynamic Flow ◽  
Engine Cylinder

Numerical study of knock occurrence in an internal combustion engine using VVT strategy and different compression ratios

2018 ◽  
Author(s):  
Deborah Domingos da Rocha ◽  
Fabio de Castro Radicchi ◽  
Paulo César de Ferreira Gomes ◽  
Marcello Brunocilla ◽  
Ramon Molina Valle
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Numerical Study ◽  
Internal Combustion

Efficiency of energy conversion using shock waves

1985 ◽  
Vol 63 (3) ◽  
pp. 339-345
Author(s):  
J. M. Dewey ◽  
D. J. McMillin
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Positive Phase ◽  
Driving Mechanism ◽  
Chamber Length ◽  
Compression Chamber

The flux-corrected transport algorithm has been used to simulate shock-wave flows in linear and spherically converging and diverging tubes in order to determine the energy distributions in the flows and the conversion efficiencies of energy to mechanical work. This was done to evaluate the possibility of using the positive phase of a shock wave, rather than combustion products, as the driving mechanism in an internal-combustion engine, and to suggest the optimum configuration of a supercharging device that uses shock waves to extract energy from the exhaust gases of internal-combustion engines. It is concluded that the positive phase of a shock wave would not be especially useful as the primary driving mechanism of an internal-combustion engine. In the case of the supercharging energy exchangers, the simulations indicate that for charging pressure ratios lower than about 5:1, a linear tube with a compression-chamber length of about 40% would be most efficient, while at higher pressure ratios a converging conical tube with a compression-chamber length of about 10% would be preferred.

scholarly journals Numerical Study of a Direct Injection Internal Combustion Engine Burning a Blend of Hydrogen and Dimethyl Ether

Drones ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 23
Author(s):  
Galia Faingold ◽  
Leonid Tartakovsky ◽  
Steven Frankel
Keyword(s):  
Internal Combustion Engine ◽  
Dimethyl Ether ◽  
Combustion Engine ◽  
Numerical Study ◽  
Numerical Models ◽  
Direct Injection ◽  
Internal Combustion ◽  
Navier Stokes ◽  
Combustion Modeling ◽  
Eddy Simulation

In the reported study, various aspects of dimethyl ether/hydrogen combustion in a Reactivity Controlled Compression Ignition (RCCI) engine are numerically evaluated using Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES). Early direct injection and mixture propagation were also explored, along with peculiaritis of dimethyl ether combustion modeling. The numerical models are validated using available experimental results of a partially premixed dimethyl ether jet flames and an optically accessible internal combustion engine with direct hydrogen injection. LES showed more predictive results in modeling both combustion and mixture propagation. The same models were applied to a full engine cycle of an RCCI engine with stratified reactivity, to gain phenomenological insight into the physical processes involved in stratified reactivity combustion. We showed that 3D and turbulence considerations had a great impact on simulation results, and the LES was able to capture the pressure oscillations typical for this type of combustion.

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