Study of nonequilibrium regenerative heat exchange in positive displacement compressors

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BACKGROUND: An important task in the design of thermal engines is the evaluation of power losses in different processes to determine the installation efficiency. One of the processes that generates power losses in the compressor is the process of nonequilibrium regenerative heat exchange (NRHE) of the compressed gas with the working cavity walls. This heat exchange occurs at a significant temperature difference, which can lead to noticeable power losses. Modern compressor design methods do not consider losses from nonequilibrium regenerative heat exchange and do not describe them separately from other types of losses.

AIM: This study investigates the mechanism of losses during regenerative heat exchange between the gaseous working flow out and the working cavity walls and evaluates the scale of these losses.

METHODS AND RESULTS: This work provides a qualitative description of the mechanism for the formation of losses from NRHE. As a result of solving the problem of unsteady thermal conductivity, an analytical expression for calculating such losses is derived based on the Gouy-Stodola theorem.

CONCLUSIONS: The study revealed that power losses from NRHE account for a significant share in the overall balance of machine losses. Parameters influencing the magnitude of these losses were also determined, and recommendations were developed to reduce them.

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作者简介

Artem Borisenko

Bauman Moscow State Technical University

编辑信件的主要联系方式.
Email: borart@bmstu.ru
ORCID iD: 0000-0002-4818-3702
SPIN 代码: 2859-5006

Cand. Sci. (Tech.)

俄罗斯联邦, Moscow

Anton Zharov

Bauman Moscow State Technical University

Email: zharov_a@bmstu.ru
ORCID iD: 0000-0001-9945-0850
SPIN 代码: 8581-1809

Cand. Sci. (Tech.)

俄罗斯联邦, Moscow

Anna Valiakina

Bauman Moscow State Technical University

Email: avaliakyna@rambler.ru
ORCID iD: 0000-0002-7709-1209
SPIN 代码: 7679-2022

Cand. Sci. (Tech.)

俄罗斯联邦, Moscow

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2. Fig. 1. Schematic indicator diagram showing the direction of heat flow: BDC and TDC — bottom and top dead centers, respectively; psuc, pdis — suction and discharge pressures, respectively; V–h — the described volume per crankshaft revolution.

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3. Fig. 2. Mechanism of entropy generation in the process of nonequilibrium regenerative heat exchange.

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4. Fig. 3. Qualitative nature of the change in gas temperature Tg and inner surface of the working cavity Ts.

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