Investigation of Thrust Augmentation and Acoustic Performance by Ejectors on PDE

Xu, Guangwen; Wang, Chunsheng; Li, Ning; Huang, Xiaolong

doi:10.1515/tjj-2015-0002

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…And the most obvious reduction effect was seen under the installation of annular nozzle #4. Here, a maximum attenuation of 1617 4. Pa was recorded at 10 m. It can be observed from Fig.6(c) that the peak sound pressure of the detonation sound wave at 60 • achieved an amplification of annular nozzles #2 and #4 but a reduction of the annular nozzle #3.…”

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confidence: 76%

“…[3] The detonation sound wave is produced by the pressure pulsation of the medium caused by a series of complex waves such as shock waves outside the detonation tube and jet induced shock waves during the detonation process. [4] The preliminary research results show that the noise generated by manned aircraft with PDEs as the propulsion system is equivalent to the noise level of B-1B bombers. Therefore, when PDEs are employed as the propulsion system, the high-intensity noise and vibration generated during its operation will pose a serious threat to the aircraft's structural sonic fatigue, overall performance, and safety.…”

Section: Introductionmentioning

confidence: 98%

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Experimental study of the influence of annular nozzle on acoustic characteristics of detonation sound wave generated by pulse detonation engine

Kang¹,

Li²,

Huang³

et al. 2022

Chinese Phys. B

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Acoustic characteristics of the detonation sound wave generated by a pulse detonation engine with an annular nozzle, including peak sound pressure, directivity, and A duration, are experimentally investigated while utilizing gasoline as fuel and air as oxidizer. Three annular nozzle geometries are evaluated by varying the ratio of inner cone diameter to detonation tube exit diameter from 0.36 to 0.68. The experimental results show that the annular nozzles have a significant effect on the acoustic characteristics of the detonation sound wave. The annular nozzles can amplify the peak sound pressure of the detonation sound wave at 90 deg while reducing it at 0 deg and 30 deg. The directivity angle of the detonation sound wave is changed by annular nozzles from 30 deg to 90 deg. The A duration of the detonation sound wave at 90 deg is also increased by the annular nozzles. These changes indicate that the annular nozzles have an important influence on the acoustic energy distribution of the detonation sound wave, which amplify the acoustic energy in a direction perpendicular to the tube axis and weaken it along the direction of the tube axis.

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mentioning

confidence: 76%

Section: Introductionmentioning

confidence: 98%

Experimental study of the influence of annular nozzle on acoustic characteristics of detonation sound wave generated by pulse detonation engine

Kang¹,

Li²,

Huang³

et al. 2022

Chinese Phys. B

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“…The results showed that the sound pressure level of HPDE is about 4 dB less than that of PDE, and that the impulse sound pressure level reduces about 2 dB. Xu et al [9][10][11][12][13] studied the formation and propagation process of PDE sound by combing the experimental method and numerical method. The results showed that the detonation peak noise is proportional to −3 power of the radial distance in near-field.…”

Section: Introductionmentioning

confidence: 99%

Acoustic characteristics of pulse detonation engine sound propagating in enclosed space*

Kang¹,

Li²,

Wang³

et al. 2020

Chinese Phys. B

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Acoustic characteristics of pulse detonation engine (PDE) sound propagating in enclosed space are numerically and experimentally investigated. The finite element software LS-DYNA is utilized to numerically simulate the PDE sound propagating in enclosed space. Acoustic measurement systems are established for testing the PDE sound in enclosed space, and the time-frequency characteristics of PDE sound in enclosed space are reported in detail. The experimental results show that the sound waveform of PDE sound in enclosed space are quite different from those in open space, and the reflection and superposition of PDE sound on the walls of enclosed space results in the sound pressure oscillating obviously. It is found that the peak sound pressure level (PSPL) and overall sound pressure level (OASPL) of PDE sound in enclosed space are higher than those in open space and their difference increases with the rise of propagation distance. The results of the duration of PDE sound indicate that the A duration of PDE sound in enclosed space is higher than that in open space except at measuring points located at 2-m and 5-m while the B duration is higher at each of all measuring points. Results show that the enclosed space has a great influence on the acoustic characteristic of PDE sound. This research is helpful in performing PDE experiments in enclosed laboratories to prevent the PDE sound from affecting the safety of laboratory environment, equipment, and staffs.

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“…Its energy is mainly concentrated in the low frequency part, which is composed of the fundamental frequency and harmonic frequency of the airflow pulsation. Xu et al [9][10][11][12] studied the detonation acoustic of single-tube PDE, and analyzed the effects of nozzle, ejector and fill factor on the near-field acoustic characteristics of PDE. It is found that the PDE detonation noise is mainly composed of impact noise (which is produced by the shock waves) and jet noise (which is produced by the jet), and both the impact noise and the jet noise decrease as the distance increases.…”

Section: Introductionmentioning

confidence: 99%

Study on Influence of Diameter on Detonation Acoustic Characteristics of Pulse Detonation Engine

Xu¹,

Wang²,

Zhu

et al. 2020

International Journal of Turbo &Amp; Jet-Engines

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The experiment system of pulse detonation engine is set up to investigate on influence of diameter on detonation acoustic characteristic. The research of detonation acoustic characteristic of pulse detonation engine for four different diameters in different angles is carried out. Results from the test show that as the PDE diameter increasing, there are increases in amplitudes of impact noise in all angles, and the growth rate of amplitude of impact noise in the 90° direction is generally greater than that in the 0° direction. The smaller PDE diameter is, the distance of most obvious directivity at 0° turning to most obvious directivity at 30° is shorter. When the distance is shorter, such as 200 mm, the duration of detonation acoustic is increasing with the increase of PDE diameter, however, when the distance is longer, such as 3000 mm, it is just the opposite. The maximum duration of detonation acoustic is appeared in 3000 mm under 30 mm PDE diameter which reaches to 1.44 ms.

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Investigation of Thrust Augmentation and Acoustic Performance by Ejectors on PDE

Cited by 7 publications

References 16 publications

Experimental study of the influence of annular nozzle on acoustic characteristics of detonation sound wave generated by pulse detonation engine

Experimental study of the influence of annular nozzle on acoustic characteristics of detonation sound wave generated by pulse detonation engine

Acoustic characteristics of pulse detonation engine sound propagating in enclosed space*

Study on Influence of Diameter on Detonation Acoustic Characteristics of Pulse Detonation Engine

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