Mistuning Effects on Aero-elastic Stability of Contra-Rotating Turbine Blades

Zhang, Xiaobo; Wang, Yanrong

doi:10.1007/s42405-018-0108-1

Cited by 3 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These is consistent with the engine order of the modes with higher aeroelastic damping in the tuned case as shown in Figure 4b. Such an consistency is the same with previous studies concerning harmonic mistuning [14,15,33]. Under each level of mass ratio, the distribution of piezoelectric materials are optimized using the aforementioned approach.…”

Section: Mistuning Pattern Designsupporting

confidence: 57%

“…As the frequency migration caused by mistuning is identified as the crucial factor influencing the aeroelastic stability [7,8], researchers have to intentionally impose certain mistuning pattern to maximum frequency migrations so as to achieve the best beneficial effects. Researchers have studied alternate patterns [9][10][11][12][13], sinusoidal patterns [14,15] and others [16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improving Aeroelastic Stability of Bladed Disks with Topologically Optimized Piezoelectric Materials and Intentionally Mistuned Shunt Capacitance

Liu

Fan

et al. 2022

Materials

View full text Add to dashboard Cite

It is well known that bladed disks with certain patterns of mistuning can have higher aeroelastic stability than their tuned counterparts. This requires small but accurate deviation of the mechanical properties on each blade sector, and currently it is difficult to realize by mechanical manufacturing. In this paper, we propose an adaptive strategy to realize the intentional mistuning for the improvement of aeroelastic stability. The basic idea is to bond or embed piezoelectric materials to each blade and use different shunt capacitance on each blade as the source of mistuning. When the shunt capacitance varies from zero (open-circuit, OC) to infinity (short-circuit, SC), the stiffness of each blade changes within a relatively small interval. In this way, the required small difference of stiffness among blades is altered into a relatively larger difference of the shunt capacitance. This provides a more feasible and robust way to implement the intentional mistuning, provided that the variation interval of blade stiffness between OC and SC contains the limits of required mistuning. Thus, it is critical to maximize the ability of changing the blade stiffness by shunt capacitance with limited amount of piezoelectric materials. To do so, a straightforward approach is proposed to get the best distribution of piezoelectric materials on the blade for the targeting mode. This approach is based on the FE model of the bladed disc, and the piezoelectric materials are introduced by replacing elements (if they are embedded) or adding an extra layer of elements (if they are bonded). An empirical balded disc with NASA-ROTOR37 profile is used as the example. With a proper design of the mistuning pattern and replace use piezoelectric materials of only 10% the blade mass, the proposed method can significantly improve the aeroelastic stability of bladed disks.

show abstract

Section: Mistuning Pattern Designsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Improving Aeroelastic Stability of Bladed Disks with Topologically Optimized Piezoelectric Materials and Intentionally Mistuned Shunt Capacitance

Liu

Fan

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…Previous studies indicated that the capacity of MCRFs can be modified by optimizing the design of the impeller structures and the angles of installation. (10)(11)(12)(13)(14) Some studies (15)(16)(17)(18)(19) found that optimizing the gap between the impeller tips of rotors may significantly improve the efficiency and stability of operation for an MCRF system. This is because the gap size of R1 may affect the occurrence and development of a turbulence trail in the impeller tip region, and thus the flow conditions in the impellers of R2.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Variable-speed Control for Enhancing the Performance of a Mine Counter-rotating Fan System

Ai¹,

Qin²,

Wang³

et al. 2021

Sensors and Materials

View full text Add to dashboard Cite

The mine counter-rotating fan (MCRF) is important in tunnel construction and is also widely used for ventilation in mining. The need to improve the performance of MCRF systems has been attracting the interest of researchers. An MCRF is composed of two vane rotors that rotate in opposite directions. We propose a novel adaptive variable-speed (AVS) control method to improve the performance of an MCRF system. The proposed method is based on the concept of adaptively controlling the speed of the second vane rotor according to changes in the working conditions of the whole fan system. To evaluate the performance of our proposed AVS control method, experiments were performed using various sensors to detect pressure and mass flow rates when using our newly designed MCRF system. Results show that, with the proposed AVS control method, the problem of the rotor output torque rising and falling markedly during large and small mass flows, respectively, is overcome. Furthermore, the problems of overload and a low blocking margin are solved. As a result, the overall pressure increase and performance of the whole fan system are improved.

show abstract

A Modal Interpretation for Aeroelastic Stability Enhancement of Mistuned Bladed Disks

Liu

Fan

et al. 2022

Aerospace

View full text Add to dashboard Cite

Understanding the mechanism of the aeroelastic stability improvement induced by mistuning is essential for the design of bladed disks in aero-engines. In this paper, a quantitative interpretation is given. It starts by projecting the mistuned aeroelastic modes into the space spanned by the tuned modes. In this way, the mistuned aeroelastic damping can be expressed by the superposition of the tuned damping. Closed-form expressions are found, providing clear interpretations of several frequently reported trends in the literature. Further, a prediction approach is proposed, where the analysis of aeroelastic coupling only needs to be performed once, and it is decoupled from the analysis of the mistuning effect. The advantages are two-fold. First, the design of the mistuning pattern is accelerated. Second, this allows one to introduce more accurate data or models of aeroelastic damping. An empirical bladed disk with NASA-ROTOR37 profile is used as an example, and the alternate, wave, and random patterns are considered.

show abstract

Mistuning Effects on Aero-elastic Stability of Contra-Rotating Turbine Blades

Cited by 3 publications

References 20 publications

Improving Aeroelastic Stability of Bladed Disks with Topologically Optimized Piezoelectric Materials and Intentionally Mistuned Shunt Capacitance

Improving Aeroelastic Stability of Bladed Disks with Topologically Optimized Piezoelectric Materials and Intentionally Mistuned Shunt Capacitance

Adaptive Variable-speed Control for Enhancing the Performance of a Mine Counter-rotating Fan System

A Modal Interpretation for Aeroelastic Stability Enhancement of Mistuned Bladed Disks

Contact Info

Product

Resources

About