A system and a method for evaluating atomization efficiency of a wind-driven atomizer. The system for evaluating atomization efficiency of a wind-driven atomizer comprises a detection platform, a wind tunnel mechanism and a traction measurement mechanism are arranged above the detection platform, the traction measurement mechanism is disposed beside the wind outlet end of the wind tunnel mechanism, an atomizer mechanism and an atomization measurement mechanism are sequentially disposed on the detection platform along the direction of a wind field provided by the wind tunnel mechanism, and the atomizer mechanism is connected with the traction measurement mechanism. The system and the method may effectively evaluate the atomization efficiency and provide quantitative evaluation indicators for the detection of working performance of the wind-driven atomizer, and has the advantages of convenient operation, accurate detection, precise measurement results, and high reliability of evaluation indicators.

A system and a method for evaluating atomization efficiency of a wind-driven atomizer. The system for evaluating atomization efficiency of a wind-driven atomizer comprises a detection platform, a wind tunnel mechanism and a traction measurement mechanism are arranged above the detection platform, the traction measurement mechanism is disposed beside the wind outlet end of the wind tunnel mechanism, an atomizer mechanism and an atomization measurement mechanism are sequentially disposed on the detection platform along the direction of a wind field provided by the wind tunnel mechanism, and the atomizer mechanism is connected with the traction measurement mechanism. The system and the method may effectively evaluate the atomization efficiency and provide quantitative evaluation indicators for the detection of working performance of the wind-driven atomizer, and has the advantages of convenient operation, accurate detection, precise measurement results, and high reliability of evaluation indicators.

A wind tunnel sting comprising a support member and a wind tunnel sting damper. The support member having a first support-member end configured for coupling with a wind tunnel, and a second support-member end configured for coupling with a balance. The wind tunnel sting damper having a reactive member, and a viscoelastic member disposed between the reactive member and the support member wherein, the reactive member is sized relative to the support member so as to radially compress the viscoelastic member against the support member.

A flow conditioning structure is disposed about a central axis of an unducted thrust producing apparatus. The unducted thrust producing apparatus has a propeller that generates thrust in a working fluid by rotating about the central axis. The propeller is comprised of blades each with a free end. Each blade also has a leading edge where the working fluid enters during forward thrust operation. The flow conditioning structure comprises a structure forming a passage and the structure forming the passage controls a speed and a direction of the working fluid drawn into the unducted thrust producing apparatus so as to approximate operational speeds and operational directions of the working fluid entering the unducted thrust producing apparatus during operations of a vehicle.

A flow conditioning structure is disposed about a central axis of an unducted thrust producing apparatus. The unducted thrust producing apparatus has a propeller that generates thrust in a working fluid by rotating about the central axis. The propeller is comprised of blades each with a free end. Each blade also has a leading edge where the working fluid enters during forward thrust operation. The flow conditioning structure comprises a structure forming a passage and the structure forming the passage controls a speed and a direction of the working fluid drawn into the unducted thrust producing apparatus so as to approximate operational speeds and operational directions of the working fluid entering the unducted thrust producing apparatus during operations of a vehicle.

A photovoltaic system includes a collection of photovoltaic modules, a base supporting the collection of photovoltaic modules, and a damper coupled between the collection of photovoltaic modules and the base. The damper resists movement of the photovoltaic modules relative to the base. The damper has a first damping ratio when the collection of photovoltaic modules moves at a first rate relative to the base and a second damping ratio when the collection of photovoltaic modules moves at a second rate relative to the base, and the damper passively transitions from the first damping ratio to the second damping ratio.

Disclosed herein is a technique of configuring flexible photovoltaic tracker systems with high damping and low angle stow positions. Under dynamic environmental loads implementing a high amount of damping (e.g., greater than 25% of critical damping, greater than 50% of critical damping) or a very high amount of damping (e.g., 100% or greater of critical damping, infinite damping) enables the flexible tracker system to prevent problematic aeroelastic behaviors while positioned in a low stow angle. The disclosed technique is further applied to a prototyping process during wind tunnel testing.

Disclosed herein is a technique of configuring flexible photovoltaic tracker systems with high damping and low angle stow positions. Under dynamic environmental loads implementing a high amount of damping (e.g., greater than 25% of critical damping, greater than 50% of critical damping) or a very high amount of damping (e.g., 100% or greater of critical damping, infinite damping) enables the flexible tracker system to prevent problematic aeroelastic behaviors while positioned in a low stow angle. The disclosed technique is further applied to a prototyping process during wind tunnel testing.

A photovoltaic system includes a collection of photovoltaic modules, a base supporting the collection of photovoltaic modules, and a damper coupled between the collection of photovoltaic modules and the base. The damper resists movement of the photovoltaic modules relative to the base. The damper has a first damping ratio when the collection of photovoltaic modules moves at a first rate relative to the base and a second damping ratio when the collection of photovoltaic modules moves at a second rate relative to the base, and the damper passively transitions from the first damping ratio to the second damping ratio.

A wind tunnel test equipment using wind force integration includes: a structural model whose interior is empty; an internal support disposed inside the structural model; and load sensors disposed outside the internal support and coming into close contact with the inner surfaces of the structural model to measure aerodynamic forces applied to the structural model.