THE ANALYSIS OF NON-STATIONARY GAS FLOWS IN INDUCTION PIPES OF MULTI-CYLINDER OTTO ENGINES

DIE ANALYSE INSTAETIONARER STROEMUNGSVORGAENGE IN SAUGROHREN AN MEHRZYLINDERVERGASERMOTOREN

The modulation of induction pipe systems of multi-cylinder otto engines cannot be successfully achieved as long as the non-stationary gas flow process is not known, i.e. The variable quantities of pressure, temperature and velocity of the particles depending on location and time. Such a modulation is necessary to gain a high and equal delivery in the single cylinders or a uniform distribution of the gas mixture which is the necessary condition for a successful decontamination of the exhaust gas. The experimental consideration of the temporarily variable quantities causes some problems except for measuring the pressure. The computational procedure of the non-stationary dynamics of compressible fluids (method of characteristics, method of differences) which enable us to calculate the "flow diagram" make such an analysis possible. The fundamental equations of the stationary dynamics of compressible fluids describe the boundary and transient conditions. At the "institut fuer konstruktionstechnik" of the "ruhr-universitaet bochum" a system of programs was developed that enables the calculation of the cyclic process of internal combustion engines considering the non-stationary flow process in the connected pipe systems. The system of programs is now used in a special research project of calculating gas flow in induction pipes of multi-cylinder engines. The first results that have been obtained will be reported. The theoretical computational model is adjusted to the real induction pipe system by considering the experimental determined parameters of mass flow of the special boundary and transient conditions. A calculation has been made for the variable quantities of gas changes in a six-cylinder engine with the engine speed at full load. The result shows that the process of the non-stationary flow in the induction pipe of the engine is not satisfactory for delivery and air degree. Causes will be given and propositions will be made for an improved construction of the induction pipe. By means of this analysis it will be shown how an optimisation can be gained by a synchronisation of the lengths of the pipes on the inlet and outlet side. A transfer of these results to the pipe system of a multi-cylinder engine is only possible under limited conditions. /TRRL/

• Supplemental Notes:
  • This report was presented at the 16th International Technical Congress.
• Corporate Authors:

  International Federation of Auto Techniques Engs

  3 Avenue du President Wilson
  F 75116 Paris,   France 
• Authors:
  • Seifert, H
• Publication Date: 0

Language

• German

Media Info

• Pagination: 1 p.

Subject/Index Terms

• TRT Terms: Computer programs; Conferences; Electromagnetic induction; Flow; Gases; Internal combustion engines; Mathematical models; Motors; Particles; Physical distribution; Pipe; Pressure; Speed; Temperature; Velocity
• Uncontrolled Terms: Cylinders; Gas flow; Models
• ITRD Terms: 8525: Conference; 9016: Distribution (gen); 5430: Flow (fluid); 6734: Gas; 6927: Induction; 6473: Mathematical model; 1334: Motor; 4511: Particle; 3361: Pipe; 5412: Pressure; 8645: Software; 5408: Speed; 6722: Temperature
• Subject Areas: Freight Transportation; Highways; Safety and Human Factors; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00163379
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: May 3 1978 12:00AM