CrazyEngineers Forum - Mechanical & Civil Engineering

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• Engine cavitation
• Compressor: Discussion and problem solving.
• The Largest Land Vehicle on Earth
• 6 stroke i.c.engine
• robotic arm >acrylic or hardwood??

Engine cavitation Posted: 29 Jul 2011 09:53 AM PDT It is sometime that I have been thinking about this topic. I have seen diesel engines which are prone to cavitation. Now I want to calculate *the amount* of cavitation in a single cylinder bike engine. By the term amount, I mean that I want to measure the cavitation. As we know temperature difference induces pressure difference in a cylinder. Do you have any approach how to do that? Any good ideas are welcome. As for not, I believe I have to adopt a mathematical approach. In other words suggest me where to start from. :)

Compressor: Discussion and problem solving. Posted: 29 Jul 2011 09:31 AM PDT Starting from basic: A compressor is a device used to compress anything feasible. In our case those feasible things are gases or air. A compressor is an important building block in any power generating cycle which basically consists of four building blocks Evaporator Compressor Condenser Turbine So a compressor is a work consuming device. And it is only natural that any design engineer would like to have a device working on minimum possible power. So under ideal conditions, a compressor is always expected to work on an isothermal process. While in reality it is never possible. In worst designer would make it work on isentropic process (imagine a PV diagram). Under practical conditions, the process is a Polytropic process. You can very well calculate the amount of work done required in each case by observing the diagram. So a compressor (I will restrict my discussion to reciprocating one) is generally comprised of stages. A single stage compressor does have some problem associated with it. A single cylinder will be subjected to very high pressure, this is associated with a danger of leakage past piston and the cooling is also rendered ineffective. The cylinder will have to be robust enough for sustaining such extreme conditions. On the other hand, a multi stage compressor will have effective cooling in between the suction and delivery pressure and suction pressure. However it should be noticed that efficiency increase obtained by adding each stage decreases with each addition of stage. A compromise must hence be made between efficiency and cost incurred for adding each stage. To give you an example, for adding one stage, you require $100 which will promise you 5% efficiency rise, however the next stage though require $100, will only promise you 2.5% efficiency. So the investment should be worth it. A wise man will always be ready to make a compromise. Another important component here is intercooler, nothing but a heat exchanger is provided, which cools the compressed air/ gas. It is generally provided between two stages.

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6 stroke i.c.engine Posted: 29 Jul 2011 04:50 AM PDT 6 strokes engine r used or not.why we learn only 2 n 4 stroke engine :(

robotic arm >acrylic or hardwood?? Posted: 28 Jul 2011 08:45 PM PDT i making my own robotic arm parts but the problem is which is best choice to make it???acylic or hardwood?? shud i use cnc machine or leth ?? i will then attach servos in arm so my concern is cheap and light weight material (enough to handle the weight of arm)

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