Experimental study on two-phase adiabatic expansion in a reciprocating expander with intake and exhaust processes

Hiroshi Kanno, Naoki Shikazono

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In the present study, visualization and measurement of two-phase adiabatic expansion in a reciprocating cylinder with intake and exhaust processes is carried out. Experimental setup with piston and cylinder which mimics reciprocating expander was constructed and boiling phenomenon is visualized. Working fluids are water and ethanol, and their inlet temperatures are 100 and 80 °C, respectively. The piston and cylinder are made of polycarbonate with diameter of Dp = 55 mm. The inner pressure is measured by the pressure sensor embedded in the piston. Indicated work and indicated adiabatic efficiency are calculated from the P–V diagram. The effects of heat capacity loss from the working fluid to the inner wall and the remained liquid, injection loss and non-equilibrium loss are evaluated. Evaporated gas velocity at the interface is calculated from the volume and density of the vapor phase, which is found to be almost proportional to the piston velocity. The adiabatic efficiency increases with the piston velocity due to the reduction of heat capacity loss. When the maximum piston velocity exceeds 300 mm/s, the effect of heat capacity loss becomes negligible. Measured indicated adiabatic efficiency of water is about 86% at maximum piston velocity of vp,max = 380 mm/s, while that of ethanol is about 82% for the same condition.

Original languageEnglish
Pages (from-to)1004-1011
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Volume102
DOIs
Publication statusPublished - 2016 Nov 1
Externally publishedYes

Fingerprint

pistons
Pistons
expansion
Specific heat
polycarbonate
working fluids
specific heat
Ethanol
ethyl alcohol
liquid injection
inlet temperature
Fluids
Water
Pressure sensors
polycarbonates
pressure sensors
Polycarbonates
boiling
Boiling liquids
water

Keywords

  • Adiabatic efficiency
  • Boiling
  • Expander
  • Steam cycle
  • Two-phase flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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title = "Experimental study on two-phase adiabatic expansion in a reciprocating expander with intake and exhaust processes",
abstract = "In the present study, visualization and measurement of two-phase adiabatic expansion in a reciprocating cylinder with intake and exhaust processes is carried out. Experimental setup with piston and cylinder which mimics reciprocating expander was constructed and boiling phenomenon is visualized. Working fluids are water and ethanol, and their inlet temperatures are 100 and 80 °C, respectively. The piston and cylinder are made of polycarbonate with diameter of Dp = 55 mm. The inner pressure is measured by the pressure sensor embedded in the piston. Indicated work and indicated adiabatic efficiency are calculated from the P–V diagram. The effects of heat capacity loss from the working fluid to the inner wall and the remained liquid, injection loss and non-equilibrium loss are evaluated. Evaporated gas velocity at the interface is calculated from the volume and density of the vapor phase, which is found to be almost proportional to the piston velocity. The adiabatic efficiency increases with the piston velocity due to the reduction of heat capacity loss. When the maximum piston velocity exceeds 300 mm/s, the effect of heat capacity loss becomes negligible. Measured indicated adiabatic efficiency of water is about 86{\%} at maximum piston velocity of vp,max = 380 mm/s, while that of ethanol is about 82{\%} for the same condition.",
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author = "Hiroshi Kanno and Naoki Shikazono",
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AU - Shikazono, Naoki

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N2 - In the present study, visualization and measurement of two-phase adiabatic expansion in a reciprocating cylinder with intake and exhaust processes is carried out. Experimental setup with piston and cylinder which mimics reciprocating expander was constructed and boiling phenomenon is visualized. Working fluids are water and ethanol, and their inlet temperatures are 100 and 80 °C, respectively. The piston and cylinder are made of polycarbonate with diameter of Dp = 55 mm. The inner pressure is measured by the pressure sensor embedded in the piston. Indicated work and indicated adiabatic efficiency are calculated from the P–V diagram. The effects of heat capacity loss from the working fluid to the inner wall and the remained liquid, injection loss and non-equilibrium loss are evaluated. Evaporated gas velocity at the interface is calculated from the volume and density of the vapor phase, which is found to be almost proportional to the piston velocity. The adiabatic efficiency increases with the piston velocity due to the reduction of heat capacity loss. When the maximum piston velocity exceeds 300 mm/s, the effect of heat capacity loss becomes negligible. Measured indicated adiabatic efficiency of water is about 86% at maximum piston velocity of vp,max = 380 mm/s, while that of ethanol is about 82% for the same condition.

AB - In the present study, visualization and measurement of two-phase adiabatic expansion in a reciprocating cylinder with intake and exhaust processes is carried out. Experimental setup with piston and cylinder which mimics reciprocating expander was constructed and boiling phenomenon is visualized. Working fluids are water and ethanol, and their inlet temperatures are 100 and 80 °C, respectively. The piston and cylinder are made of polycarbonate with diameter of Dp = 55 mm. The inner pressure is measured by the pressure sensor embedded in the piston. Indicated work and indicated adiabatic efficiency are calculated from the P–V diagram. The effects of heat capacity loss from the working fluid to the inner wall and the remained liquid, injection loss and non-equilibrium loss are evaluated. Evaporated gas velocity at the interface is calculated from the volume and density of the vapor phase, which is found to be almost proportional to the piston velocity. The adiabatic efficiency increases with the piston velocity due to the reduction of heat capacity loss. When the maximum piston velocity exceeds 300 mm/s, the effect of heat capacity loss becomes negligible. Measured indicated adiabatic efficiency of water is about 86% at maximum piston velocity of vp,max = 380 mm/s, while that of ethanol is about 82% for the same condition.

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KW - Two-phase flow

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