Flow in turbomachines is highly three-dimensional and complex. The flow may be incompressible, compressible, or mixed flow. The flow is further complicated by the high temperatures of working fluids. Large gradients of pressure, velocity, angle, temperature, and density in all directions and with time occur in most of turbomachinery. Two-phase flow is also encountered in many turbomachines. Although CFD is being extensively used to predict flow in turbomachines, it is essential that CFD results must be validated experimentally. A wide variety of measurement techniques are required starting with simple performance measurements to most complex measurements in the rotating blade rows of turbomachines. Substantial advances are made in different measurement techniques used for measurement of turbomachinery flow, heat transfer, and acoustics. The present special issue addresses these advances for the use of researchers in academia, industry, and R&D laboratories.

We invite investigators to contribute original research articles as well as review articles that address various measurement techniques in turbomachinery. Potential topics include, but are not limited to:

Research articles using these techniques are also welcome. Special emphasis will be given to articles that validate CFD results against experimental results using the advanced measurement techniques.