By Richard D. Atkins
This e-book provides the elemental ideas required for the checking out and improvement of inner combustion engine powertrain platforms, supplying the recent automobile engineer with the elemental instruments required to successfully perform significant assessments.
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Extra info for An Introduction to Engine Testing and Development
If inaccurate, a correction figure can be entered. 15 illustrates the installation of a pressure transducer. 15 Installation of in-cylinder pressure transducers. Flow Measurement The purpose of flow measurement is to measure the flow of fluids around the engine. The most common application is for measuring coolant andlor oil flows within the engine. Coolant flow is a requirement if a thermal balance test series is to be undertaken. 17). The venturi meter measures flow rate in terms of pressure drop across a venturi (or tapered throat) within a pipe.
The following are characteristics of the AC or DC transient dynamometer: (a) Constant torque corresponding to maximum current and excitation. (b) Performance limited by maximum permitted power output of the machine. (c) Maximum permitted speed. These performance curves are known as absorption or dynamometer envelopes. The engineer will use this data when selecting a dynamometer for specific engine performance. For performance development, when best possible accuracy is required, then it is desirable to choose the smallest machine that will cope with the largest engine to be tested.
The dispersal and size of the fuel droplets throughout the air stream and on the mass of the airlhel mixture). When the air temperature is too low, fuel does not mix as effectively with the air stream due to the higher density of the air; therefore, it tends to fall to the sides and floor of the inlet tract. This gives an uneven mixture and poor atomization, which may cause misfiring and so forth. In turn, this can lead to higher emissions of hydrocarbons and carbon monoxide. In the case of air temperatures that are too high, the air charge is expanded by its heat and, as a consequence, has a reduced density.
An Introduction to Engine Testing and Development by Richard D. Atkins