Aircraft Galley Oven Cyclone Steam Separation with Fan Boost
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Solution Overview
Problem
Cyclone steam separators are ineffective in ovens operating at low pressures due to insufficient airstream speed, leading to inadequate removal of water vapor from the outflow, which can increase humidity and pose risks to sensitive equipment in environments like aircraft galleys.
Innovation Solution
The system incorporates an exhaust fan to inject pressurized air into the exhaust conduit, increasing the airstream speed through the cyclone steam separator, and includes a water conduit for recycling separated water back into the oven, enhancing water vapor removal and maintaining desired humidity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclone steam separator is used to remove water vapor from the oven outflow, then water vapor removal capability is improved, but it becomes ineffective in low-pressure ovens due to insufficient airstream speed
Solution Approach 1:
An exhaust fan is introduced as an intermediary device to boost the airstream speed between the oven outlet and the cyclone steam separator. The fan actively increases the velocity of the moist air flow, ensuring that the cyclone separator receives sufficient-speed airflow to effectively separate water vapor, thereby resolving the contradiction between maintaining reliable water vapor removal and operating in low-pressure environments where natural airflow speed is insufficient.
Solution Approach 2:
The system changes the velocity parameter of the airstream by introducing an exhaust fan that actively accelerates the airflow. This parameter change transforms the low-speed airflow characteristic of low-pressure ovens into a high-speed airflow suitable for effective cyclone separation, enabling the steam separator to function reliably across different pressure conditions.
2Reliability
If an exhaust fan is added to increase airstream speed, then water vapor removal effectiveness is improved, but device complexity increases
Solution Approach 1:
The exhaust fan serves multiple functions within the system: it not only boosts airstream speed to enable effective cyclone separation, but also helps maintain overall exhaust flow and can be integrated with the existing oven ventilation infrastructure. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while achieving improved water vapor removal effectiveness.
3Reliability
If water is separated and removed from the airstream, then humidity control is improved, but loss of water substance occurs
Solution Approach 1:
Instead of discarding the separated water as waste, the system recovers it through a condensate recirculation system that returns the collected water back to the oven. This recovery approach maintains effective humidity control by removing excess moisture from the exhaust stream while preventing water loss, as the condensed water is reused within the oven system rather than being wasted.
Solution Approach 2:
The condensate recirculation system establishes a feedback loop where separated water is collected, treated if necessary, and returned to the oven. This feedback mechanism ensures that water is not lost but continuously recycled, maintaining the water balance in the system while still achieving effective humidity control in the exhaust air.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces water and water vapor content in the airstream, preventing humidity issues and allowing for the recycling of water, thus addressing the limitations of cyclone steam separators in low-pressure ovens and improving operational safety.
Implementation Method 1
an exhaust fan configured to inject pressurized air into the exhaust conduit at a point between the air outlet and the cyclone steam separator inlet
Implementation Method 2
a cyclone steam separator configured to reduce the water and/or water vapor content of a flow of moist air flowing through it
Implementation Method 3
a water conduit connected, at a first end, to the water outlet and configured to channel water from the water outlet back into the inner cavity of the oven
Data Source
AI summary
An oven for use in an aircraft galley, comprising an inner cavity configured to heat one or more food items, the inner cavity comprising an air outlet configured to allow a flow of air and steam to escape the inner cavity. The oven comprises an exhaust conduit connected, at a first end, to the air outlet external to the inner cavity and configured to channel the flow of air and steam leaving the inner cavity via the air outlet. The oven further comprises a cyclone steam separator configured to reduce the water and/or water vapor content of a flow of moist air flowing through it, the cyclone steam separator comprising a cyclone steam separator inlet and a cyclone steam separator outlet.