Abstract
The Stirling-type pulse tube refrigerator is a widely used refrigerator that has been extensively applied in space. An optimal phase angle between the pressure wave and volume flow is essential for a pulse tube refrigerator. The active displacer installed at the hot end of a pulse tube can be used to actively control the phase angle and enable recovery of the expansion power at the warm end of the pulse tube, leading to high efficiency. The main parameters for a pulse tube refrigerator with an active displacer are the phase and displacement of the active displacer. This manuscript studies the impact of displacer phase and displacement on a 40 K single-stage pulse tube refrigerator with an active displacer by thermoacoustic analysis, which is helpful for studying the thermodynamic characteristics of such a refrigerator and provides a method for more effective design and computing. The effects on the pressure, acoustic power, and cooling capacity are investigated by analytically solving the thermoacoustic model. A pulse tube refrigerator developed in our laboratory is tested, and the experimental results are compared with the results of thermoacoustic analysis.
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Abbreviations
- A :
-
Area (\({\text{m}}^{2}\))
- \({\varvec{a}}_{1}\) :
-
Phase constant defined in Eq. (17)
- \({\varvec{a}}_{{\varvec{2}}}\) :
-
Phase constant defined in Eq. (18)
- \({\varvec{a}}_{{\varvec{3}}}\) :
-
Phase constant defined in Eq. (19)
- \({\varvec{a}}_{{\varvec{4}}}\) :
-
Phase constant defined in Eq. (20)
- c :
-
Acoustic compliance per unit length (m2/Pa)
- C :
-
Acoustic compliance (m/Pa)
- \({\varvec{d}}_{{\varvec{1}}}\) :
-
Function defined in Eq. (22)
- \({\varvec{d}}_{{\varvec{2}}}\) :
-
Function defined in Eq. (22)
- \({\varvec{d}}_{{\varvec{3}}}\) :
-
Function defined in Eq. (22)
- \({\varvec{d}}_{{\varvec{4}}}\) :
-
Function defined in Eq. (22)
- \(d_{{\text{h}}}\) :
-
Hydraulic diameter (m)
- \(D\) :
-
Diameter (m)
- \(f_{M}\) :
-
Friction factor under turbulent flow
- g :
-
Simplified attenuation constant for volume flow
- \(i\) :
-
Imaginary unit
- \(L\) :
-
Length (m)
- \(l\) :
-
Acoustic inertance per unit length (kg/m5)
- \(m\) :
-
Mass (kg)
- n :
-
Polytropic index
- \({\varvec{P}}\) :
-
Pressure phasor (Pa)
- PV:
-
Acoustic power (W)
- \(Q\) :
-
Cooling capacity (W)
- \(R_{{\text{g}}}\) :
-
Specific gas constant (J/Kg K)
- \(r_{\mu }\) :
-
Viscous resistance per unit length (m)
- \(r_{{\text{h}}}\) :
-
Hydraulic radius (m)
- \(T\) :
-
Temperature (K)
- \({\text{t}}\) :
-
Time (s)
- \({\varvec{U}}\) :
-
Volume flow phasor (m3/s)
- \({\varvec{V}}\) :
-
Volume phasor (m3)
- \(W\) :
-
Work (W)
- \(x\) :
-
Position (m)
- \({\varvec{\alpha}}\) :
-
Phase constant defined in Eq. (31)
- \(\beta\) :
-
Fitting constant defined in Eq. (26)
- \(\gamma\) :
-
Ratio of isobaric to isochoric specific heats
- \(\delta_{k}\) :
-
Viscous penetration depth (m)
- \(\delta_{\mu }\) :
-
Thermal penetration depth (m)
- \(\varepsilon\) :
-
Equivalent roughness (m)
- \({\epsilon }\) :
-
Coefficient of expansion
- \(\theta\) :
-
Phase angle (°)
- \(\lambda\) :
-
Thermal conductivity (W m−1 K−1)
- \(\mu_{{\text{m}}}\) :
-
Dynamic viscosity (N s m−2)
- \(\omega\) :
-
Angular frequency (°/s)
- \(\rho\) :
-
Density (kg/m3)
- \(\tau\) :
-
Periodic time (s)
- \(\varphi\) :
-
Volumetric porosity
- CCT:
-
Compressor connecting tube
- cond:
-
Conductivity
- cold:
-
Cold end of the pulse tube
- CC:
-
Compression space in the main compressor
- CT:
-
Connecting tubes
- DC:
-
Compression space in the phase shift compressor
- \({\text{DT}}\) :
-
Displacer tube
- gas:
-
Working gas
- H :
-
Ambient temperature
- i:
-
Inner part of the regenerator
- L :
-
Cold end temperature
- net:
-
Net refrigeration capacity
- m:
-
Mean value
- mt:
-
Regenerative material
- P:
-
Pressure wave
- P_CC:
-
Pressure in the main compressor space
- P_DC:
-
Pressure in the phase shift compressor space
- PT:
-
Pulse tube
- RE:
-
Regenerator
- U :
-
Volume flow
- w:
-
Wall
- | |:
-
Magnitude of phasor
- 〈 〉:
-
Time average
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Acknowledgements
This work is supported by the Hundred Talents Program of the Chinese Academy of Sciences, the National Natural Science Foundation Projects (51806231), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB35000000, XDB35040102).
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Ying, K., Jiang, Z., Yin, W. et al. Experimental Investigation and Thermoacoustic Analysis of a Single-Stage Pulse Tube Refrigerator with an Active Displacer. J Low Temp Phys 210, 514–535 (2023). https://doi.org/10.1007/s10909-022-02929-z
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DOI: https://doi.org/10.1007/s10909-022-02929-z