Recent content by MysticDream

Because the heat energy is converted to kinetic energy and the velocity increases. Rayleigh flow refers to a flow through a constant area duct. So if the temperature increases but expansion is constrained by the constant area duct, then velocity must increase. The formulas for Rayleigh flow...

Thanks for the detailed explanation. There's one thing I'm still trying to wrap my head around. Say the nozzle ended at point 2 and there is no divergent part (the exit is point 2). The only way for the velocity to reach mach 1 at point 2 is for the external pressure to be .528 * p1. Now lets...

In a compressible flow there is a critical pressure ratio between the upstream and downstream stagnation pressures in order for the flow to become choked, which always happens at the minimum cross-sectional area, or throat. In a duct (or nozzle) that only converges and exits to a stagnation...

Are you sure about this? See the post below yours.

Ok, I think I understand. The temperature would increase but pressure would have to increase because the flow velocity is choked at Mach 1. That changes the downstream condition and overall mass flow rate. So when it is described that no more heat can be added to a Rayleigh flow, they mean it...

Bernoulli's principle. As velocity increases, pressure decreases. In a Rayleigh flow, as heat is added, velocity increases.

Will have another look at it.

I don't have my mass flow rate. That is the problem. I need to know the radial component of the velocity through the impeller to calculate the mass flow rate from the density, velocity, and cross sectional area. All I have is my impeller geometry and the RPM. I would imagine the radial...

Rayleigh flow refers to frictionless, non-adiabatic flow through a constant area duct where the effect of heat addition or rejection is considered. Consider the case of air traveling through a heat exchanger: The air travels through the duct and picks up heat from the surface of the heat...

Yes, the velocity triangle is the problem. At this point, most of it is unknown so I'll have to do some more reading.

I must make a correction, the slip factor is the ratio between ideal whirl velocity and the actual whirl velocity, also called tangential component of the absolute velocity. Apparently I can't edit my reply above.

Thanks for the book suggestion. Yeah, I'm interested in a compressor specifically. The slip factor is the ratio between the tip speed (tangential) of the impeller and the actual tangential component of the absolute velocity of the gas. Again, I don't have a mass or volumetric flow rate. I...

How can I calculate the absolute velocity of air at the outlet of a centrifugal compressor if I have: Diameter of impeller RPM Slip factor I've been reading for weeks and cannot seem to find the answer to this question. For anyone who is familiar with the subject, I'm sure you know about the...

Wow, thanks a lot! This is a lot of information. I couldn't find any source online with all these equations.

Sorry, I had planned to study your response. You currently have a much better understanding of the subject than I do. I appreciate your insight. In my last comment I was referring to the initial equation that the 2nd commenter posted which only had P1, P2, and volumetric flow rate as...