Compressor cascade for secondary flow investigation. A high speed compressor cascade wind tunnel is used for investigations of secondary flow phenomena occurring in the region between corner and side wall of axial compressors. The objective of the research is efficiency increase of turbo machinery.

## What is axial compressor cascade?

In the axial compressor, the air flows parallel to the axis of rotation. The compressor is composed of several rows of airfoil cascades. Some of the rows, called rotors, are connected to the central shaft and rotate at high speed.

What type of aerofoil is used for cascade testing experiment?

The blades for the test cascade were made of aluminum using the casting method. The blades had a parabolic camber line and C4 base profile. These were mainly concerned with testing at low Mach number, 0.20–0.30 based on mean air conditions relative to the rotor and are thus more applicable for this experimental work.

How does a cascade air system work?

In a cascade storage system, several large cylinders are used to bring a small cylinder up to a desired pressure, by always using the supply cylinder with the lowest usable pressure first, then the cylinder with the next lowest pressure, and so on.

### How does a cascade work in a compressor?

Within compressor blades, the flow is moving from a low static pressure at inlet toward a higher static pressure at exit. The fundamental difficulty in compressors is getting the flow to negotiate this pressure rise without generating high loss or separating.

### When is the flow through a cascade incompressible?

When flow velocities through a cascade are such that Mach numbers are above 0.3, the flow can no longer be treated as incompressible. The peak Mach number on the surface of a conventional compressor blade is significantly higher than the inlet Mach number.

What is a typical correlation for m in a compressor Cascade?

A typical correlation for m in a compressor cascade is where the maximum camber of the blade is at distance a from the leading edge. Deviation increases further as the incidence changes from the nominal condition and any flow separation will cause a rapid increase in deviation.

How does a cascade effect occur in a market?

Wikipedia describes a cascade effect as “an inevitable and sometimes unforeseen chain of events due to an act affecting a system”. A cascade effect occurs in markets when an event or connection of events kickstarts a positive feedback loop, which then goes on to dominate price action until it burns itself out and the process goes into reverse.