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Many energy recovery, drive cycles (Organic and Steam Rankine cycles) and rocket propulsion cycles require the use of a turbine that operates at low volumetric flow and high-pressure ratio. Additional requirements include low cost, reduced weight, and reduced axial length (for robust rotor dynamics).

Reverse-Brayton Cryocoolers

by Dimitri Deserranno on Apr 19, 2018 2:22:09 PM

Perhaps it is because Spring is so slow to come this year, but I have been thinking a lot about refrigeration and the different types of systems there are. Refrigeration systems that operate below 120 K are commonly referred to as cryocoolers. Figure 1 illustrates the most common usage of cryocoolers in the fields of superconductivity, liquefaction, and infrared sensors. As you can see, cryocoolers cover a wide range in temperatures, cooling loads, and applications.

Many gas turbines with radial compressors utilize a radial-to-axial inlet duct upstream of the first compressor stage. Aside from the fact that flow in the duct generates aerodynamic losses, the flow profiles at the duct exit, delivered to the inlet of the first impeller, also affects the performance of the compressor. 

Electric Pumps for Space Propulsion

by Kerry Oliphant on Apr 5, 2018 12:57:56 PM

The recent success of Rocket Lab, putting small satellites into orbit with its Electron rocket, is a significant milestone in the evolution of space flight.  The Electron rocket is powered by a set of 5,000 lbf thrust Rutherford engines that use battery-powered electric motor-driven pumps to supply the LOX and Kerosene to the thrust chamber.  Battery-powered propellant feed pumps are a leap in technology that will reduce the development time and lower the costs of space flight.

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