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Gas compressor
About: Gas compressor is a research topic. Over the lifetime, 91817 publications have been published within this topic receiving 552209 citations.
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TL;DR: In this article, micro-flow control actuation embedded in a stator vane was used to successfully control separation and improve near stall performance in a multistage compressor rig at NASA Glenn.
Abstract: Micro-flow control actuation embedded in a stator vane was used to successfully control separation and improve near stall performance in a multistage compressor rig at NASA Glenn. Using specially designed stator vanes configured with internal actuation to deliver pulsating air through slots along the suction surface, a research study was performed to identify performance benefits using this microflow control approach. Pressure profiles and unsteady pressure measurements along the blade surface and at the shroud provided a dynamic look at the compressor during microflow air injection. These pressure measurements lead to a tracking algorithm to identify the onset of separation. The testing included steady air injection at various slot locations along the vane. The research also examined the benefit of pulsed injection and actively controlled air injection along the stator vane. Two types of actuation schemes were studied, including an embedded actuator for on-blade control. Successful application of an online detection and flow control scheme will be discussed. Testing showed dramatic performance benefit for flow reattachment and subsequent improvement in diffusion through the use of pulsed controlled injection. The paper will discuss the experimental setup, the blade configurations, and preliminary CFD results which guided the slot location along the blade. The paper will also show the pressure profiles and unsteady pressure measurements used to track flow control enhancement, and will conclude with the tracking algorithm for adjusting the control.
127 citations
TL;DR: In this article, the long-term performance of a direct-expansion solar assisted heat pump (DX-SAHP) system for domestic use, which can offer space heating in winter, air conditioning in summer and hot water during the whole year, was investigated.
126 citations
Book•
13 Jul 1999
TL;DR: In this paper, the authors use the Fisher Universal Gas Sizing Equation (FUGSE) with the nozzle-based model for control valve gas flow to estimate the internal energy of reaction and the enthalpy of reaction using calorimeters.
Abstract: Introduction Fundamental Concepts of Dynamic Simulation Thermodynamics and the conservation equations Steady state incompressible flow Flow through ideal nozzles Control valve flow Steady-state compressible flow Control valve liquid flow Liquid flow through the installed control valve Gas flow through the installed control valve Accumulation of liquids and gases in process vessels Two-phase systems - boiling, condensation and distillation Chemical reactions Turbine nozzles Steam and gas turbines Steam and gas turbines - simplified model Turbo pumps and compressors Flow networks Pipeline dynamics Distributed components: heat exchangers and tubular reactors Nuclear reactors Process controllers and control valve dynamics Linearization Model Validation Appendices: Comparative size of energy terms Explicit calculation of compressible flow using approximating functions Equations for control valve flow in SI units Comparison of Fisher Universal Gas Sizing Equation, FUGSE, with the nozzle-based model for control valve gas flow Measurement of the internal energy of reaction and the enthalpy of reaction using calorimeters Approximations used in modelling turbine reaction stages in off-design conditions Fuel pin average temperature and effective heat transfer coefficient Conditions for emergence from saturation for P + I controllers with integral desaturation
126 citations
TL;DR: In this article, a small-scale organic rankine cycle (ORC) prototype is used for the simulation of a commercial HVAC compressor with a power of about 1.5kW.
126 citations
TL;DR: A new high-speed and low power design of the 3-2 counter and 4-2 compressor of a parallel array multiplier has better speed and power performance than other recently proposed approaches.
Abstract: A 3-2 counter and a 4-2 compressor are the basic components in the partial product summation tree of a parallel array multiplier. A new high-speed and low power design of these components is presented. Owing to the reduction of the internal load capacitance, the counter and compressor have better speed and power performance than other recently proposed approaches.
126 citations