Design and Simulation of Two Stroke Engines

Chapter 5 - Computer Modeling of Engines
Hence, during an engine simulation using the theory of Sees. 2.16 and 2.17, the effective
throat area of the port posed by the disc valve system at any juncture (see Eq. 2.16.4) is
defined by At; and the numerical value of At) is that given by Ae in Eq. 5.2.10. To carry out
this exercise during simulation, all of the data shown in Fig. 5.3 are required as input data to
it.
The use of a reed valve for the intake system
The use of an automatic valve for the control of intake flow is quite common in pulsating
air-breathing devices, not only for motorcycles and outboards [1.12, 1.13] but for air and
refrigerant compressors [6.6] and in pulsejets [5.22], such as the German VI "doodlebug."
The format of the design can assume many mechanical configurations, but the V block shape
shown in Fig. 5.4, Fig. 6.27, or Plate 6.1, has become commonplace in high-performance
motorcycles. In outboards, and in other uses where space is at a premium or the specific
performance requirement is not so great, a simpler flat plate design is often found.
VIEW ON B VIEW ON A
Fig. 5.4 Design dimensions of a reed petal and reed block.
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