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Technical Brief

Analysis of a Novel Technique for Temperature Rise Abatement in Liquid Piston Compressors–External Gas Injection

[+] Author and Article Information
Hari Subramaniam Bhaskaran

Department of Mechanical and Aerospace Engineering,
North Carolina State University,
Raleigh, NC 27606
e-mail: hsubram2@ncsu.edu

Paul Ro

Department of Mechanical and Aerospace Engineering,
North Carolina State University,
Raleigh, NC 27606
e-mail: ro@ncsu.edu

Joong-Kyoo Park

Department of Mechanical and Aerospace Engineering,
North Carolina State University,
Raleigh, NC 27606
e-mail: jpark15@ncsu.edu

Kishore Ranganath Ramakrishnan

Department of Mechanical and Aerospace Engineering,
North Carolina State University,
Raleigh, NC 27606
e-mail: kramakr4@ncsu.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received February 4, 2016; final manuscript received December 20, 2016; published online March 15, 2017. Assoc. Editor: Samuel Sami.

J. Thermal Sci. Eng. Appl 9(2), 024503 (Mar 15, 2017) (13 pages) Paper No: TSEA-16-1031; doi: 10.1115/1.4035969 History: Received February 04, 2016; Revised December 20, 2016

This paper analyses a novel heat transfer enhancement technique that can be used in compressors to limit the temperature rise during compression. This technique is based on the injection of external high-pressure gas into the chamber during the compression process. The impact of different factors on the effectiveness of this technique has been studied using experimental and computational methods. In the first set of trials, the location and angle of injection of the external air was varied. It was observed that the heat transfer coefficient governing the heat transfer rate from the chamber varied greatly with change in location and angle of injection. In the second set of experiments, the source pressure of the injected gas was varied from 100.66 kPa to 551.58 kPa. It was observed that the temperature rise of air in the chamber was reduced with an increase in source pressure. Additionally, the increase in chamber pressure was steeper in the higher source pressure cases. In the third set of experiments, the injection profile of the injected gas was varied. This parameter did not greatly impact the effectiveness of external gas injection. In the last set of experiments, the time of initiation of injection was varied. Earlier injection had a positive impact on reducing the temperature rise in the chamber. However, the pressure in the chamber was seen to increase more rapidly in the runs with early injection. Considering that these factors could have a positive/negative impact on the temperature and pressure in the chamber (work required for compression), it may be required to optimize the injection of external high-pressure gas depending on the application.

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Figures

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Fig. 1

Graphical representation of air impingement

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Fig. 2

Experimental setup used to study external air injection: 1, storage vessel; 2, liquid piston; 3, mass flow meter; 4, double cylinder pneumatic actuator; 5, data acquisition unit; 6,solenoid valve for air injection line; 7, air injection line; and 8, aluminum cylinder (compression chamber)

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Fig. 3

Location of temperature and pressure sensor

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Fig. 4

Schematic of various injector setups

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Fig. 10

Comparison of experimental and simulation temperature and pressure profiles for the run without injection: (a) comparison of experimental and simulated pressure data for the compression run without injection and (b) comparison of experimental and simulated temperature data for the compression run without injection

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Fig. 11

Temperature, pressure and velocity profiles inside the compression chamber during the run without injection

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Fig. 12

Comparison between experimental and simulation temperature data for the compression runs with injection

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Fig. 13

Comparison of experimental Pressure data across the four runs with injection

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Fig. 14

Comparison between experimental and simulated pressure data for case 1

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Fig. 15

Heat transfer coefficient as a function of time for all the five compression runs

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Fig. 16

Average temperature versus time for all the compression runs

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Fig. 17

Pressure, flow rate and average temperature as a function of time for experimental set 2: (a) flow rate versus time, (b) pressure versus time, and (c) average temperature versus time

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Fig. 18

Pressure and average temperature data of all the compression runs of experimental set 3: (a) pressure versus time and (b) average temperature versus time

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Fig. 19

Flow rate, pressure and average temperature as a function of time for experimental set 4: (a) flow rate versus time, (b) pressure versus time, and (c) average temperature versus time

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