Quantitative analysis of vortex added-mass and impulse generation during vortex ring formation based on elliptic Lagrangian coherent structures

Xiang, Yang; Lin, Haiyan; Zhang, Bin; Liu, Hong

doi:10.1016/j.expthermflusci.2018.02.018

Cited by 9 publications

(3 citation statements)

References 47 publications

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“…There are two commonly used methods for forming a vortex ring: (a) a piston‐cylinder (see Figure 1B), which forms a vortex ring based on the reciprocating motion of a piston; and (b) a synthetic jet actuator (see Figure 1C), which forms a vortex ring by using the vibrations of a piezoelectric lead zirconate titanate (PZT) diaphragm to cause rapid volume changes in a cavity. The piston‐cylinder is often used in water experiments; the piston moves at a lower speed, and the formed vortex ring has a low turbulence and speed, which is suitable for the study of its characteristics 28–30 . Meanwhile, the synthetic jet actuator is usually small in scale, and the formed vortex ring has a high turbulence, moves at a faster velocity, and has a smaller volume.…”

Section: Methodsmentioning

confidence: 99%

“…The piston-cylinder is often used in water experiments; the piston moves at a lower speed, and the formed vortex ring has a low turbulence and speed, which is suitable for the study of its characteristics. [28][29][30] Meanwhile, the synthetic jet actuator is usually small in scale, and the formed vortex ring has a high turbulence, moves at a faster velocity, and has a smaller volume. As such, these systems are widely used for drag reduction, heat transfer enhancement, and mixing control.…”

Section: High Ventilation Efficiencymentioning

confidence: 99%

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Potential application of using vortex ring for personalized ventilation

et al. 2020

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People spend most of their time indoors, making Indoor Air Quality an important consideration for the health of room occupants. However, the energy consumption of heating, venting, and air conditioning (HVAC) systems accounts for 10-20% of the total primary energy 1,2 and requires that the ventilation system meets challenges in regard to both improving the Indoor Air Quality and the energy saving. As a consequence, personalized ventilation (PV) has been widely considered and studied. In contrast to general ventilation, the purpose of PV systems is to create local micro-environments around people. Studies have shown that under reasonable design and use conditions, PV systems can maintain good Indoor Air Quality and reduce energy consumption. 3-7 Existing PV systems consist of placing an air terminal device (ATD) near a breathing zone (BZ) to supply conditioned fresh air directly into the zone, and to avoid dilution with old indoor air. The primary categories of PV systems include desk-mounted, chair-direct, partitioned, chair-mounted, floor-based, and overhead jet systems. 8

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Section: Methodsmentioning

confidence: 99%

Section: High Ventilation Efficiencymentioning

confidence: 99%

Potential application of using vortex ring for personalized ventilation

et al. 2020

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“…The framework of LCS has been used to study the ICVRs for some time. [16][17][18] In this paper, both FTLE field and elliptic LCS are used to show the mass transport and dynamic genesis of CVRs.…”

Section: Introductionmentioning

confidence: 99%

Lagrangian analysis of the formation and mass transport of compressible vortex rings generated by a shock tube*

Lin¹,

Xiang²,

Liu³

et al. 2021

Chinese Phys. B

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In order to understand the mass transport and the dynamic genesis associated with a compressible vortex formation, a dynamic analysis of compressible vortex rings (CVRs) generated by shock tubes by using the framework of Lagrangian coherent structures (LCSs) and finite-time Lyapunov exponents field (FTLE) is performed. Numerical calculation is performed to simulate the evolution of CVRs generated by shock tubes with 70 mm, 100 mm, and 165 mm of the driver section at the circumstances of pressure ratio = 3. The formation of CVRs is studied according to FTLE fields. The mass transport during the formation is obviously seen by the material manifold reveled by FTLE fields. A non-universal formation number for the three CVRs is obtained. Then the elliptic LCSs is implemented on three CVRs. Fluid particles separated by elliptic LCSs and ridges of FTLE are traced back to t = 0 to identify the fluid that eventually forms the CVRs. The elliptic LCSs encompass around 60% fluid material of the advected bulk but contain the majority of the circulation of the ring. The other parts of the ring carrying almost zero circulation advect along with the ring. Combining the ridges of FTLE and the elliptic LCS, the whole CVR can be divided into three distinct dynamic parts: vortex part, entrainment part, and advected part. In addition, a criterion based on the vortex part formation is suggested to identify the formation number of CVRs.

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Research on the Mechanism of Resistance Generation in Disc Acceleration Based on Lagrangian Method

Lin

Wang

et al. 2021

Proceedings of the International Conference on Aerospace System Science and Engineering 2020

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Quantitative analysis of vortex added-mass and impulse generation during vortex ring formation based on elliptic Lagrangian coherent structures

Cited by 9 publications

References 47 publications

Potential application of using vortex ring for personalized ventilation

Potential application of using vortex ring for personalized ventilation

Lagrangian analysis of the formation and mass transport of compressible vortex rings generated by a shock tube*

Research on the Mechanism of Resistance Generation in Disc Acceleration Based on Lagrangian Method

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